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Top Forums Shell Programming and Scripting General question about passing variables among shell scripts Post 302805263 by hanson44 on Thursday 9th of May 2013 11:42:04 PM
Old 05-10-2013
Quote:
So how do you pass variables into a shell script?
You pass variables from a.sh to b.sh by adding the variable after the script name, such as b.sh "$x". You receive variables in b.sh by using $1 for the first variable passed, $2 for the second, etc. Here is an example you can look at that I think makes it clearer:
Code:
$ cat a.sh
x=`date`
echo x in a.sh: $x
echo Passing x variable to b.sh script
b.sh "$x"

Code:
$ cat b.sh
echo Entering b.sh script
x="$1"
echo x in b.sh: $x
echo About to do function on x variable
y=`echo $x | cut -d " " -f 1`
echo "y (first field of x): $y"

Code:
$ ./a.sh
x in a.sh: Thu May 9 20:38:20 PDT 2013
Passing x variable to b.sh script
Entering b.sh script
x in b.sh: Thu May 9 20:38:20 PDT 2013
About to do function on x variable
y (first field of x): Thu

Note that the variable was passed as "$x" instead of $x, because without the quotes $1 would have just been "Thu".
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VM(1)								      mgetty								     VM(1)

NAME
vm - VoiceModem is the program for handling the voice modem functionality from shell scripts ACTIONS
beep options [<frequency [<length in 0.001sec>]]> diagnostics options device name (e.g. ttyS2 dial options phone number help play options [<file names]+> record options file name shell options [<shell script [shell options]]> wait options [<time in seconds]> devicetest OPTIONS
-c n use compression type n -d n set i/o device -t, -m, -i, -e, -s, -H equals to -d <2,3,4,5,6,7> -l s set device string (e.g. -l ttyS2:ttyC0) -v verbose output -w use off / on hook signal from local handset to start and stop recording -x n set debug level -L n set maximum recording length in sec -P print first DTMF tone on stdout and exit -R read and print DTMF string on stdout and exit -S s set default shell for shell scripts (e.g. -S /bin/sh) -T n set silence timeout in 0.1sec -V n set silence threshold to <n> (0-100%%) SEE ALSO
vgetty(1) POD ERRORS
Hey! The above document had some coding errors, which are explained below: Around line 30: You forgot a '=back' before '=head1' Around line 32: '=item' outside of any '=over' Around line 71: You forgot a '=back' before '=head1' perl v5.10.1 2010-04-04 VM(1)
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