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Full Discussion: assigning (numeric) command output to var tcsh
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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LEARN ABOUT SUNOS

shells

shells(4)							   File Formats 							 shells(4)

NAME

       shells - shell database

SYNOPSIS

       /etc/shells

DESCRIPTION

       The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser-
       shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root.

       A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by  the  routines
       which search the file. Blank lines are also ignored.

       The  following  default	shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/pfcsh, /bin/pfksh, /bin/pfsh, /bin/sh,
       /bin/tcsh,  /bin/zsh,  /sbin/jsh,  /sbin/sh,  /usr/bin/bash,  /usr/bin/csh,  /usr/bin/jsh,  /usr/bin/ksh,  /usr/bin/pfcsh,  /usr/bin/pfksh,
       /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh. Note that /etc/shells overrides the default list.

       Invalid shells in /etc/shells may cause unexpected behavior (such as being unable to log in by way of ftp(1)).

FILES

       /etc/shells	       lists shells on system

SEE ALSO

       vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4)

SunOS 5.10							    4 Jun 2001								 shells(4)
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