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12-06-2007
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checking for empty string in tcsh
Hi,
i'm writing a script in tcsh, and i need to check to see whether a string is empty. i think sh users use the -z function for this, but i'm using it already to check for the emptiness of a file -- surely it's not the same function for both, is it? is there another one to check for string emptiness, or am i wrong in using it to check for file emptiness? here a short sniplet of what i've written (which of course doesn't work): Code:
echo "checking length of nmlfilelist"
if( $nmlfilelist == "" ) then
echo "nmllist is empty"
exit( 1 )
endif
this raises a syntax error, which i can retrospectively understand. how should it look like? thx in advance, Pagod 
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12-06-2007
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Your code snippet works for me. If you wish to use some other means of testing for an empty string you can always using the test utility. Man test(1) for more information.
Code:
set nmlfilelist [ -z $nmlfilelist ] && echo "nmllist is empty"; exit (1)
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12-06-2007
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Hi.
Using other csh / tcsh constructs: Code:
#!/bin/tcsh
# @(#) s1 Demonstrate csh variable contents test.
echo "checking length of name"
if ( ${?name} == 0 ) then
echo " Variable name is not set."
endif
# NOTE - $ % construct tcsh only.
set name
if ( ${%name} == 0 ) then
echo " Variable name has 0 characters as value."
endif
# if( "$nmlfilelist" == "" ) then
if( "${?nmlfilelist}" == 0 ) then
echo "nmllist is empty"
exit( 1 )
endif
exit 0
Code:
% ./s1 checking length of name Variable name is not set. Variable name has 0 characters as value. nmllist is empty _____ Standard advice: avoid csh family for scripting.
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