Beginning graphing
One of the simplest graphs I have seen can be done in bash. You will need a data file and a one line executable to extract the data from the file and then display it.
data:
Irene 10
Karen 37
Andreas 41
Beatrice 23
Code:
SCALE=1; WIDTHL=10; WIDTHR=60; BAR="12345678"; BAR="${BAR//?/==========}"; while read LEFT RIGHT rest ; do RIGHT=$((RIGHT/SCALE)); printf "%${WIDTHL}s: %-${WIDTHR}s\n" "${LEFT:0:$WIDTHL}" "|${BAR:0:$RIGHT}*"; done < data
Result:
Irene: |==========*
Karen: |=====================================* Andreas: |=========================================*
Beatrice: |=======================*
Another script:
The you could get a bit more fancy with a bit of animation.
[code]
# !/bin/sh
#
# Bargraph_Generator.sh
#
# A DEMO 6 bit coloured bargraph animation for a default Bash and Terminal window on OSX 10.7.5...
# A simple Shell script to display an _AT_A_GLANCE_ real time analogue bargraph generator. It
# starts off with GREEN for OK, then YELLOW for warning and finally ending with RED for danger
# with a critical beep for values 61 to 63 inclusive.
# It assumes an 8 bit value being injected into the script which is then divided by 4 to give
# a 6 bit value which is 64 spaces width inside the Terminal. The DEMO uses a random number
# generator to give a representation of an 8 bit value so you can see it working...
#
# A shell derivative of my Python code:-
# http://code.activestate.com/recipes/577612-seven-bit-colored-analogue-bar-graph-generator-dem/?in=user-4177147
#
# To run, ensure the script is executable and change if required, then type from a Terminal:-
#
# xxxxx$ /full/path/to/Bargrapth_Generator.sh<CR>
#
# And away you go...
#
# Written in such a way that kids and newbies can understand what is going on.
#
# Originally written for a Macbook Pro 13 inch, OSX 10.7.5 using the default Terminal.
# It MIGHT work on some Linux variants but WAS intended for MacOS OSX 10.7.x and above only.
#
# The Terminal colours WILL be changed to Black background and Various foreground colours.
# It will NOT be returned back to its original state although it can be easily. If you
# need to rerturn back to default state then there are a couple of easy methods the
# simplest being type:-
#
# xxxxx$ reset<CR>
#
# And all will be corrected...
#
# Issued entirely as Public Domain and you may do with it as you please
#
# $VER Bargraph_Generator.sh_Version_0.00.10_(C)2012_B.Walker_G0LCU.
#
# Enjoy finding simple solutions to often very difficult problems...
# The required _varibales_ for ease of coding, these are the colours...
# White On Black.
WOB="\x1B[1;37;40m"
# Black On Green.
BOG="\x1B[1;30;42m"
# Black On Yellow.
BOY="\x1B[1;30;43m"
# Black On red.
BOR="\x1B[1;30;41m"
# Green On Black.
GOB="\x1B[1;32;40m"
# Yellow On Black.
YOB="\x1B[1;33;40m"
# Red On Black.
ROB="\x1B[1;31;40m"
# Set the pseudo 6 bit value to zero.
SIX_BIT_DEPTH=0
# Do a clear screen to White On Black.
printf $WOB
clear
while true
do
# Set up the screen per scan and prepare for the bargraph.
clear
printf $WOB"\n \$VER: Bargraph_Generator.sh_Version_0.00.10_(C)2012_B.Walker_G0LCU.\n\n"
printf " A horizontal, at a glance, coloured, analogue bargraph display for\n"
printf " a default Terminal inside OSX 10.7.5..\n\n\n\n\n"
printf " 0 10 20 30 40 50 60"
printf $GOB"\n +----+----+----+----+----+----+----+----+----+"$YOB"----+----+"$ROB"----+--\n"
printf $GOB" (| "$ROB")\n"
printf $GOB" +----+----+----+----+----+----+----+----+----+"$YOB"----+----+"$ROB"----+--\n\n\n\n"
# If the 6 bit value is 0, zero, do no more until printing the 6 bit value and generating another 6 bit value...
# Anything greater than or equal to 1 enters this conditional branch.
if [ "$SIX_BIT_DEPTH" -ge "1" ]
then
# If the 6 bit value is less than or equal to 46 then _plot_ the green section only.
# The '\x1B[12;8f' is the ANSI 'Esc' code that forces the print position to 12 lines by 8 columns.
if [ "$SIX_BIT_DEPTH" -le "46" ]
then
BARGRAPH=$GOB"\x1B[12;8f("$BOG
for green in $(seq 1 "$SIX_BIT_DEPTH")
do
BARGRAPH=$BARGRAPH" "
done
fi
# If the 6 bit value is greater than or equal to 47 then print the green section and _plot_ the yellow section.
if [ "$SIX_BIT_DEPTH" -ge "47" ]
then
BARGRAPH=$GOB"\x1B[12;8f("$BOG" "$BOY
for yellow in $(seq 47 "$SIX_BIT_DEPTH")
do
BARGRAPH=$BARGRAPH" "
done
fi
# If the 6 bit value is greater than or equal to 57 then print the green and yellow section and _plot_ the red section.
if [ "$SIX_BIT_DEPTH" -ge "57" ]
then
BARGRAPH=$GOB"\x1B[12;8f("$BOG" "$BOY" "$BOR
for red in $(seq 57 "$SIX_BIT_DEPTH")
do
BARGRAPH=$BARGRAPH" "
done
fi
printf "$BARGRAPH"$GOB"\n\n\n\n\n"
fi
# When the 6 bit value is greater than or equal to 61 sound a system error beep.
if [ "$SIX_BIT_DEPTH" -ge "61" ]
then
printf "\a"
fi
# Print the 6 bit value in White On Black...
printf $WOB" Random number generated "$SIX_BIT_DEPTH"...\n\n"
printf " Press Ctrl-C to stop the program...\n\n"
# Generate another 6 bit value as though from an 8 bit value...
SIX_BIT_DEPTH=$[($RANDOM % (256/4))]
# A practical lower limit for the sleep command is 'sleep 0.05'...
sleep 1
done
# End of Bargraph_Generator.sh DEMO.
# Enjoy finding simple solutions to often very difficult problems... ;o)
[/code]
One step farther:
Or then you could use a built in program such as gnuplot. It is well documented and there are a zillion examples on the web.
Here is a simple data file:
# sample 2-column data file
# -------------------------
1 1
2 4
3 9
4 16
5 25
6 36
7 49
8 64
9 81
10 100
The you want to fire up gnuplot
$ gnuplot
G N U P L O T
Version 4.6 patchlevel 0 last modified 2012-03-04
Build System: Linux i686
Copyright (C) 1986-1993, 1998, 2004, 2007-2012
Thomas Williams, Colin Kelley and many others
gnuplot home: http://www.gnuplot.info
faq, bugs, etc: type "help FAQ"
immediate help: type "help" (plot window: hit 'h')
Terminal type set to 'unknown'
gnuplot>
Set a simple terminal for now
gnuplot> set term dumb
Now let's use that data file
gnuplot> plot '2col.dat'
Or if you have Imagemagick installed you can get a bit fancier.
gnuplot> set term png
Terminal type set to 'png'
Options are 'nocrop font "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf,12" fontscale 1.0 size 640,480 '
gnuplot> set output '| display png:-'
Then run your plot again
gnuplot> plot '2col.dat' with linespoints
Try a different data file
gnuplot> set term png
Terminal type set to 'png'
Options are 'nocrop font "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf,12" fontscale 1.0 size 640,480 '
gnuplot> set output '| display png:-'
gnuplot> set style line 1 lc rgb "red"
gnuplot> set style line 2 lc rgb "blue"
gnuplot>
gnuplot> set style fill solid
gnuplot> set boxwidth 0.5
gnuplot>
gnuplot> plot "data.dat" every ::0::0 using 1:3:xtic(2) with boxes ls 1, \
> "data.dat" every ::1::2 using 1:3:xtic(2) with boxes ls 2
gnuplot>
gnuplot> set term png
Terminal type set to 'png'
Options are 'nocrop font "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf,12" fontscale 1.0 size 640,480 '
gnuplot> set output '| display png:-'
gnuplot>
gnuplot> set xrange [-pi/2:pi/2]; set yrange [-pi/2:pi/2]
gnuplot> set contour
gnuplot> set isosamples 100,100; set samples 100,100
gnuplot> splot sin(x)*cos(y) with lines palette linewidth 4
smooth palette in png: using 160 of 160 available color positions
gnuplot> pause -1
The sky is the limit have fun.
------------------------------------------
Update:
Each script takes in a csv file as input and “plots” the values as an ASCII graph in the terminal. It’s questionable how useful this actually is, but it’s a bit of fun at least. The SCALE variable controls the amount of characters used for the width of the plot area (not including the table containing labels and values).
Simple: Plot Values of each item
input file: sales
output: ./vgraph sales
Percentage graph using value and max for each item
input file: stock-list
output: ./pgraph stock-list
And the scripts…. They are both very similar, just some minor tweaks to make them do what I wanted.
vgraph
Relative Value Chart
Name Value (Max is 140)
____________________0_________._________|_________._________|100% (140)
january 140 |========================================
february 29 |========
march 26 |=======
april 54 |===============
may 72 |====================
june 86 |========================
data:
Irene 10
Karen 37
Andreas 41
Beatrice 23
Code:
SCALE=1; WIDTHL=10; WIDTHR=60; BAR="12345678"; BAR="${BAR//?/==========}"; while read LEFT RIGHT rest ; do RIGHT=$((RIGHT/SCALE)); printf "%${WIDTHL}s: %-${WIDTHR}s\n" "${LEFT:0:$WIDTHL}" "|${BAR:0:$RIGHT}*"; done < data
Result:
Irene: |==========*
Karen: |=====================================* Andreas: |=========================================*
Beatrice: |=======================*
Another script:
bar="=================================================="
barlength=${#bar}
i=0
while ((i < 100)); do
n=$((i*barlength / 100)) # Number of bar segments to draw $((i/2))
printf "\r[%-${barlength}s]" "${bar:0:n}"
((i += RANDOM%5+2)) # i = percentage done
sleep 1
done
echo
The you could get a bit more fancy with a bit of animation.
# !/bin/sh
#
# Bargraph_Generator.sh
#
# A DEMO 6 bit coloured bargraph animation for a default Bash and Terminal window on OSX 10.7.5...
# A simple Shell script to display an _AT_A_GLANCE_ real time analogue bargraph generator. It
# starts off with GREEN for OK, then YELLOW for warning and finally ending with RED for danger
# with a critical beep for values 61 to 63 inclusive.
# It assumes an 8 bit value being injected into the script which is then divided by 4 to give
# a 6 bit value which is 64 spaces width inside the Terminal. The DEMO uses a random number
# generator to give a representation of an 8 bit value so you can see it working...
#
# A shell derivative of my Python code:-
# http://code.activestate.com/recipes/577612-seven-bit-colored-analogue-bar-graph-generator-dem/?in=user-4177147
#
# To run, ensure the script is executable and change if required, then type from a Terminal:-
#
# xxxxx$ /full/path/to/Bargrapth_Generator.sh<CR>
#
# And away you go...
#
# Written in such a way that kids and newbies can understand what is going on.
#
# Originally written for a Macbook Pro 13 inch, OSX 10.7.5 using the default Terminal.
# It MIGHT work on some Linux variants but WAS intended for MacOS OSX 10.7.x and above only.
#
# The Terminal colours WILL be changed to Black background and Various foreground colours.
# It will NOT be returned back to its original state although it can be easily. If you
# need to rerturn back to default state then there are a couple of easy methods the
# simplest being type:-
#
# xxxxx$ reset<CR>
#
# And all will be corrected...
#
# Issued entirely as Public Domain and you may do with it as you please
#
# $VER Bargraph_Generator.sh_Version_0.00.10_(C)2012_B.Walker_G0LCU.
#
# Enjoy finding simple solutions to often very difficult problems...
# The required _varibales_ for ease of coding, these are the colours...
# White On Black.
WOB="\x1B[1;37;40m"
# Black On Green.
BOG="\x1B[1;30;42m"
# Black On Yellow.
BOY="\x1B[1;30;43m"
# Black On red.
BOR="\x1B[1;30;41m"
# Green On Black.
GOB="\x1B[1;32;40m"
# Yellow On Black.
YOB="\x1B[1;33;40m"
# Red On Black.
ROB="\x1B[1;31;40m"
# Set the pseudo 6 bit value to zero.
SIX_BIT_DEPTH=0
# Do a clear screen to White On Black.
printf $WOB
clear
while true
do
# Set up the screen per scan and prepare for the bargraph.
clear
printf $WOB"\n \$VER: Bargraph_Generator.sh_Version_0.00.10_(C)2012_B.Walker_G0LCU.\n\n"
printf " A horizontal, at a glance, coloured, analogue bargraph display for\n"
printf " a default Terminal inside OSX 10.7.5..\n\n\n\n\n"
printf " 0 10 20 30 40 50 60"
printf $GOB"\n +----+----+----+----+----+----+----+----+----+"$YOB"----+----+"$ROB"----+--\n"
printf $GOB" (| "$ROB")\n"
printf $GOB" +----+----+----+----+----+----+----+----+----+"$YOB"----+----+"$ROB"----+--\n\n\n\n"
# If the 6 bit value is 0, zero, do no more until printing the 6 bit value and generating another 6 bit value...
# Anything greater than or equal to 1 enters this conditional branch.
if [ "$SIX_BIT_DEPTH" -ge "1" ]
then
# If the 6 bit value is less than or equal to 46 then _plot_ the green section only.
# The '\x1B[12;8f' is the ANSI 'Esc' code that forces the print position to 12 lines by 8 columns.
if [ "$SIX_BIT_DEPTH" -le "46" ]
then
BARGRAPH=$GOB"\x1B[12;8f("$BOG
for green in $(seq 1 "$SIX_BIT_DEPTH")
do
BARGRAPH=$BARGRAPH" "
done
fi
# If the 6 bit value is greater than or equal to 47 then print the green section and _plot_ the yellow section.
if [ "$SIX_BIT_DEPTH" -ge "47" ]
then
BARGRAPH=$GOB"\x1B[12;8f("$BOG" "$BOY
for yellow in $(seq 47 "$SIX_BIT_DEPTH")
do
BARGRAPH=$BARGRAPH" "
done
fi
# If the 6 bit value is greater than or equal to 57 then print the green and yellow section and _plot_ the red section.
if [ "$SIX_BIT_DEPTH" -ge "57" ]
then
BARGRAPH=$GOB"\x1B[12;8f("$BOG" "$BOY" "$BOR
for red in $(seq 57 "$SIX_BIT_DEPTH")
do
BARGRAPH=$BARGRAPH" "
done
fi
printf "$BARGRAPH"$GOB"\n\n\n\n\n"
fi
# When the 6 bit value is greater than or equal to 61 sound a system error beep.
if [ "$SIX_BIT_DEPTH" -ge "61" ]
then
printf "\a"
fi
# Print the 6 bit value in White On Black...
printf $WOB" Random number generated "$SIX_BIT_DEPTH"...\n\n"
printf " Press Ctrl-C to stop the program...\n\n"
# Generate another 6 bit value as though from an 8 bit value...
SIX_BIT_DEPTH=$[($RANDOM % (256/4))]
# A practical lower limit for the sleep command is 'sleep 0.05'...
sleep 1
done
# End of Bargraph_Generator.sh DEMO.
# Enjoy finding simple solutions to often very difficult problems... ;o)
[/code]
One step farther:
Or then you could use a built in program such as gnuplot. It is well documented and there are a zillion examples on the web.
Here is a simple data file:
# sample 2-column data file
# -------------------------
1 1
2 4
3 9
4 16
5 25
6 36
7 49
8 64
9 81
10 100
The you want to fire up gnuplot
$ gnuplot
G N U P L O T
Version 4.6 patchlevel 0 last modified 2012-03-04
Build System: Linux i686
Copyright (C) 1986-1993, 1998, 2004, 2007-2012
Thomas Williams, Colin Kelley and many others
gnuplot home: http://www.gnuplot.info
faq, bugs, etc: type "help FAQ"
immediate help: type "help" (plot window: hit 'h')
Terminal type set to 'unknown'
gnuplot>
Set a simple terminal for now
gnuplot> set term dumb
Now let's use that data file
gnuplot> plot '2col.dat'
Or if you have Imagemagick installed you can get a bit fancier.
gnuplot> set term png
Terminal type set to 'png'
Options are 'nocrop font "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf,12" fontscale 1.0 size 640,480 '
gnuplot> set output '| display png:-'
Then run your plot again
gnuplot> plot '2col.dat' with linespoints
Try a different data file
1, 1, 2, 5 2, 4, 4, 10 3, 9, 6, 15 4, 16, 8, 20 5, 25, 10, 25 6, 36, 12, 30 7, 49, 14, 35 8, 64, 16, 40 9, 81, 18, 45 10, 100, 20, 50
gnuplot> plot '4col.csv' using 1:2 with lines, '4col.csv' using 1:3 with lines gnuplot> plot '4col.csv' using 1:2 with lines, '4col.csv' using 1:3 with lines, '4col.csv' using 1:4 with lines
Terminal type set to 'png'
Options are 'nocrop font "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf,12" fontscale 1.0 size 640,480 '
gnuplot> set output '| display png:-'
gnuplot> set style line 1 lc rgb "red"
gnuplot> set style line 2 lc rgb "blue"
gnuplot>
gnuplot> set style fill solid
gnuplot> set boxwidth 0.5
gnuplot>
gnuplot> plot "data.dat" every ::0::0 using 1:3:xtic(2) with boxes ls 1, \
> "data.dat" every ::1::2 using 1:3:xtic(2) with boxes ls 2
gnuplot>
gnuplot> set term png
Terminal type set to 'png'
Options are 'nocrop font "/usr/share/fonts/truetype/liberation/LiberationSans-Regular.ttf,12" fontscale 1.0 size 640,480 '
gnuplot> set output '| display png:-'
gnuplot>
gnuplot> set xrange [-pi/2:pi/2]; set yrange [-pi/2:pi/2]
gnuplot> set contour
gnuplot> set isosamples 100,100; set samples 100,100
gnuplot> splot sin(x)*cos(y) with lines palette linewidth 4
smooth palette in png: using 160 of 160 available color positions
gnuplot> pause -1
The sky is the limit have fun.
------------------------------------------
Update:
Each script takes in a csv file as input and “plots” the values as an ASCII graph in the terminal. It’s questionable how useful this actually is, but it’s a bit of fun at least. The SCALE variable controls the amount of characters used for the width of the plot area (not including the table containing labels and values).
Simple: Plot Values of each item
input file: sales
january,140 february,29 march,26 april,54 may,72 june,86
output: ./vgraph sales
Relative Value Chart Name Value (Max is 140) ____________________0_________._________|_________._________|100% (140) january 140 |======================================== february 29 |======== march 26 |======= april 54 |=============== may 72 |==================== june 86 |========================
Percentage graph using value and max for each item
input file: stock-list
apples,20,100 pears,40,50 cherries,100,150 mangoes,45,85 tomatoes,30,30
output: ./pgraph stock-list
Percentage Chart ____________________0_________._________|_________._________|100% apples ( 20%) |======== pears ( 80%) |================================ cherries ( 66%) |========================== mangoes ( 52%) |===================== tomatoes (100%) |========================================
And the scripts…. They are both very similar, just some minor tweaks to make them do what I wanted.
vgraph
Relative Value Chart
Name Value (Max is 140)
____________________0_________._________|_________._________|100% (140)
january 140 |========================================
february 29 |========
march 26 |=======
april 54 |===============
may 72 |====================
june 86 |========================
#!/bin/bash
#
# Value Graph (vgraph)
# Basic ASCII Graphing Tool
#
# Plot values and scale to max
#
# CSV format: Name, Value
#
# Awk isn't perfect at rounding.. .5 rounds down
#
# v1.1 sol@subnetzero.org
if [ -z $1 ]; then
printf "Usage: pgraph [datafile]\n"
exit 1
fi
# Set Vars
# FILLER and ENDDELIM are used for drawing bars.
ENDDELIM="="
FILLER="="
SCALE=40
INPUTFILE=$1
NAME=(`awk -F"," '{print $1}' < "$INPUTFILE"`)
TOTAL=(`awk -F"," '{print $2}' < "$INPUTFILE"`)
# Get Max qty for scaling
MAXQTY=0
for VALUE in ${TOTAL[*]}
do
if [ "$VALUE" -gt "$MAXQTY" ]; then
MAXQTY=$VALUE
fi
done
# Make graph header and markings
printf "\n Relative Value Chart\n"
printf "\nName Value (Max is $MAXQTY)\n"
printf "____________________0"
QTRSCALE=`echo "$SCALE / 4" | bc -l | awk '{printf("%.0f",$0)}'`
HALFSCALE=`echo "$SCALE / 2" | bc -l | awk '{printf("%.0f",$0)}'`
THRSCALE=`echo "$SCALE * 0.75" | bc -l | awk '{printf("%.0f",$0)}'`
LCNT=1
while [ "$LCNT" -le "$SCALE" ];
do
case $LCNT in
$QTRSCALE) printf ".";;
$HALFSCALE) printf "|";;
$THRSCALE) printf ".";;
$SCALE) printf "|100%% ($MAXQTY)\n";;
*) printf "_";;
esac
LCNT=$(( $LCNT + 1 ))
done
# Draw graph bars
i=0
for ITEM in ${NAME[*]}
do
# Print Category name in format along with info and bars
LENGTH=`echo "scale=2;(( ${TOTAL[$i]} / $MAXQTY ) * $SCALE )" |\
bc |\
awk '{printf("%.0f",$0)}'`
printf "%-12.12s %-6.6s |" "$ITEM" "${TOTAL[$i]}"
BLOCKS=""
while [ "$LENGTH" -gt "0" ]; do
if [ "$LENGTH" -eq "1" ]; then
BLOCKS="$BLOCKS$ENDDELIM"
else
BLOCKS="$BLOCKS$FILLER"
fi
LENGTH=$(( $LENGTH - 1 ))
done
printf "$BLOCKS\n"
i=$(( $i + 1 ))
done
printf "\n\n"
pgraph
./pgraph.sh stock-list max is 150 Percentage Chart ____________________0_________._________|_________._________|100% apples ( 20%) |======== pears ( 80%) |================================ cherries ( 66%) |========================== mangoes ( 52%) |===================== tomatoes (100%) |========================================
#!/bin/bash
#
# PercentageGraph (pgraph)
# Basic ASCII Graphing Tool
#
# CSV format: Name,Used,Total (or Maximum)
#
# Awk isn't perfect at rounding.. .5 rounds down
#
# v1.1 sol@subnetzero.org
if [ -z $1 ]; then
printf "Usage: pgraph [datafile]\n"
exit 1
fi
# Set Vars
# FILLER and ENDDELIM are used for drawing bars.
ENDDELIM="="
FILLER="="
SCALE=40
INPUTFILE=$1
NAME=(`awk -F"," '{print $1}' < "$INPUTFILE"`)
USED=(`awk -F"," '{print $2}' < "$INPUTFILE"`)
TOTAL=(`awk -F"," '{print $3}' < "$INPUTFILE"`)
# Get Max qty for scaling
MAXQTY=0
for VALUE in ${TOTAL[*]}
do
if [ "$VALUE" -gt "$MAXQTY" ]; then
MAXQTY=$VALUE
fi
done
echo "max is $MAXQTY"
# Make graph header and markings
printf "\n Percentage Chart\n"
printf "____________________0"
QTRSCALE=`echo "$SCALE / 4" | bc -l | awk '{printf("%.0f",$0)}'`
HALFSCALE=`echo "$SCALE / 2" | bc -l | awk '{printf("%.0f",$0)}'`
THRSCALE=`echo "$SCALE * 0.75" | bc -l | awk '{printf("%.0f",$0)}'`
LCNT=1
while [ "$LCNT" -le "$SCALE" ];
do
case $LCNT in
$QTRSCALE) printf ".";;
$HALFSCALE) printf "|";;
$THRSCALE) printf ".";;
$SCALE) printf "|100%%\n";;
*) printf "_";;
esac
LCNT=$(( $LCNT + 1 ))
done
# Draw graph bars
i=0
for ITEM in ${NAME[*]}
do
# Print Category name in format along with info and bars
LENGTH=`echo "scale=2;(( ${USED[$i]} / ${TOTAL[$i]} ) * $SCALE )" |\
bc | \
awk '{printf("%.0f",$0)}'`
PCT=`echo "scale=2;(( ${USED[$i]} / ${TOTAL[$i]} ) * 100)" |\
bc |\
awk '{printf("%.0f",$0)}'`
printf "%-12.12s (%3.3s%%) |" "$ITEM" "$PCT"
BLOCKS=""
while [ "$LENGTH" -gt "0" ]; do
if [ "$LENGTH" -eq "1" ]; then
BLOCKS="$BLOCKS$ENDDELIM"
else
BLOCKS="$BLOCKS$FILLER"
fi
LENGTH=$(( $LENGTH - 1 ))
done
printf "$BLOCKS\n"
i=$(( $i + 1 ))
done
printf "\n\n"
Hi! Nice post. I just have a couple of comments about Bargraph_Generator.sh:
ReplyDelete1) On Linux, I had to replace the first line by "#!/bin/bash", as it seems you used some shell features not available in plain old "sh".
2) In the very likely case that your terminal supports Unicode, you can use semigraphical characters to have a better looking bargraph. Also, using characters in the range U+2589 (left seven eighths block) through U+258F (left one eighth block), you can size the bar with a resolution of 1/8 of a character cell, which is amenable to very smooth animations. It could look roughly like this:
░░░░░0░░░░░░░░░10░░░░░░░░20░░░░░░░░30░░
░░░░╭┼────┬────┼────┬────┼────┬────┼──╮
░░░░│▐██████████████▊░░░░░░░░░░░░░░░░░│
░░░░╰┼────┴────┼────┴────┼────┴────┼──╯
OK, doesn't look so good here: that's because I had to replace the spaces by U+2591 (light shade) in order to keep the alignments. But see http://edgar-bonet.org/misc/unicode-bargraph.png for a proper rendering on a terminal.
Regards.
What is the line number in the article?
DeleteThe “line number in the article”? I am not sure I understand your question. If you are asking about where exactly I saw one of your scripts fail, it's the script near the top, showing an animation on the terminal. The one you named Bargraph_Generator.sh, in a comment inside the script itself. As for how and where it fails, note that:
DeleteIf the script starts with " # !/bin/sh" or "# !/bin/sh", it works, as this line is considered a comment and just ignored. If it starts with "#!/bin/sh" (no space before `!'), it is a proper shebang invoking /bin/sh, and it fails with:
./Bargraph_Generator.sh: 119: ./Bargraph_Generator.sh: Syntax error: "(" unexpected (expecting "done")
If it starts with "#!/bin/bash" (a shebang invoking /bin/bash) it also works.
Thanks for the post. I'm using it on my smart home to show simple data (as voltage status) on my rack monitor.
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