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Top Forums UNIX for Dummies Questions & Answers assigning (numeric) command output to var tcsh Post 302230024 by drl on Thursday 28th of August 2008 12:22:23 PM
Old 08-28-2008
Hi.

Keeping in mind that:
Quote:
The `@' command permits
numeric calculations to be performed and the result assigned to a vari-
able. Variable values are, however, always represented as (zero or
more) strings.

-- excerpt from man tcsh
We can use the following little script:
Code:
#!/usr/bin/env tcsh

@ result = 31416 * 2
echo $result

exit

As a source to set a variable in a larger script:
Code:
#!/usr/bin/env tcsh

# @(#) s1       Demonstrate script result capture.

echo
echo "(Versions displayed with local utility version)"
sh -c "version >/dev/null 2>&1" && version tcsh
echo

echo " Nonce script:"
cat -n t1

echo
echo " Results:"
set var1 = `./t1`
echo " var1 is $var1"

exit 0

Producing:
Code:
% ./s1

(Versions displayed with local utility version)
tcsh 6.13.00

 Nonce script:
     1  #!/usr/bin/env tcsh
     2
     3  @ result = 31416 * 2
     4  echo $result
     5
     6  exit

 Results:
 var1 is 62832

Note that the odd quotes (`) are backtics, not straight single quotes. See the man page for other details ... cheers, drl

(The usual advice advocating the use of Bourne family shells as opposed to csh family applies here.)
 

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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.10 3 Aug 1994 echo(1B)
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