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Top Forums Shell Programming and Scripting "lockfile: command not found" Post 302481344 by courteous on Friday 17th of December 2010 08:48:26 AM
Old 12-17-2010
Question "lockfile: command not found"

Just tried out the following code from "Using lockfiles in shell scripts":
Code:
 #!/bin/bash

if [ -e number.txt ]; then
        echo "File exists"
else
        echo "File does not exists. Create file now."
        echo 1 > number.txt
fi

lockfile script.lock

a=$(/usr/bin/tail -n 1 number.txt)

if [ $a -gt 1 ]; then
        a=$(/usr/bin/tail -n 1 number.txt)
        /usr/bin/expr $a - 1 >> number.txt
fi

if [ $a -lt 2 ]; then
        a=$(/usr/bin/tail -n 1  number.txt)
        /usr/bin/expr $a + 1 >> number.txt
fi

rm -f script.lock

The two red lines are enough for semaphore behaviour, right? Then I ran above script 1000 times:
Code:
for a in {1..1000}; do bash script.sh & done

Alas, I get an error lockfile: command not found. Smilie

Terminal suggests I install procmail (sudo apt-get install procmail), but why should I install a "mail delivery agent (MDA)"? Smilie

EDIT: I just went ahead and installed procmail. Smilie

Last edited by courteous; 12-17-2010 at 10:22 AM..
 

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set_color(1)                                                           fish                                                           set_color(1)

NAME
set_color - set_color - set the terminal color set_color - set the terminal color Synopsis set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR] Description Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple, cyan, white and normal. o -b, --background Set the background color o -c, --print-colors Prints a list of all valid color names o -h, --help Display help message and exit o -o, --bold Set bold or extra bright mode o -u, --underline Set underlined mode o -v, --version Display version and exit Calling set_color normal will set the terminal color to whatever is the default color of the terminal. Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey font color, while set_color --bold white will result in a white font color. Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator. set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and incomplete terminfo databases, and may lack color information for terminals that support it. Download and install the latest version of ncurses and recompile fish against it in order to fix this issue. Version 1.23.1 Sun Jan 8 2012 set_color(1)
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