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How to compare that file name is empty?

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Top Forums Shell Programming and Scripting How to compare that file name is empty?
# 8  
Old 12-07-2009
you can also use grep's exit status $? to check if there is a pattern or not. if there is a pattern exit value is 0, otherwise 1.

Code:
mo@mo-laptop:~$ ls | grep scripts
scripts
mo@mo-laptop:~$ echo $?
0
mo@mo-laptop:~$ ls | grep nofilehere
mo@mo-laptop:~$ echo $?
1

just put it in an if-then statement.

in bash:

Code:
grep something
if [ $? == 1 ]; then
      do something
fi



---------- Post updated at 11:35 PM ---------- Previous update was at 11:34 PM ----------

oops, someone beat me to it
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LEARN ABOUT CENTOS

zip_name_locate

ZIP_NAME_LOCATE(3)					     Library Functions Manual						ZIP_NAME_LOCATE(3)

NAME

       zip_name_locate - get index of file by name

LIBRARY

       libzip (-lzip)

SYNOPSIS

       #include <zip.h>

       int zip_name_locate(struct zip *archive, const char *fname, int flags);

DESCRIPTION

       The  zip_name_locate  function returns the index of the file named fname in archive.  If archive does not contain a file with that name, -1
       is returned.  The are specified by or'ing the following values, or 0 for none of them.

	      ZIP_FL_NOCASE  Ignore case distinctions.

	      ZIP_FL_NODIR   Ignore directory part of file name in archive.

RETURN VALUES

       zip_name_locate returns the index of the file named fname or -1, if archive does not contain an entry of that name.

ERRORS

       The zip_name_locate function fails and sets the error information to ZIP_ER_NOENT if no entry of the name fname is found  in  the  archive.
       If one of the arguments is invalid, the error information is set to ZIP_ER_INVAL.

SEE ALSO

       libzip(3), zip_get_name(3)

AUTHORS

       Dieter Baron <dillo@giga.or.at> and Thomas Klausner <tk@giga.or.at>

NiH								  October 4, 2006						ZIP_NAME_LOCATE(3)