[Cialug] [OT]: Shell script globbing

[Chris Freeman]

I would do this:

if [ `ls *.bad | wc -l` -gt 0 ]
   then
   echo Bad
   fi

Chris

On Dec 20, 2007 12:58 PM, Brown, David [DNR] <David.Brown at dnr.iowa.gov>
wrote:

> Another way to check if any ".bad" files exist is piping the ls output
> to grep, searching for ".bad", with the count flag set and storing this
> output in a variable.
>
> E.g.
>      N_bad_files=`ls | fgrep -c ".bad"`
>
>      if [ $N_bad_files -gt 0 ] ;then
>        echo bad
>      fi
>
>
>
> -----Original Message-----
> From: cialug-bounces at cialug.org [mailto:cialug-bounces at cialug.org] On
> Behalf Of Daniel A. Ramaley
> Sent: Thursday, December 20, 2007 11:22 AM
> To: Central Iowa Linux Users Group
> Subject: [Cialug] [OT]: Shell script globbing
>
> I have what should be a simple shell scripting problem. If any .bad
> files exist, then the script should do some stuff (display an error, do
> some cleanup, and exit, though for testing i've simplified it). So far
> i've come up with 2 solutions, one requiring a variable and running
> "ls", the other requiring a seemingly superfluous "for" loop. Is there a
>
> more elegant solution i've not discovered?
>
> My first attempt, doesn't work because -e expects only 1 argument and
> there may be multiple .bad files:
>    if [ -e *.bad ] ; then
>        echo Bad
>    fi
>
> My first working solution, letting ls handle the glob and doing a string
>
> comparison on the result:
>    GLOB=`ls *.bad 2> /dev/null`
>    if [ -n "$GLOB" ] ; then
>        echo Bad
>    fi
>
> My second solution; the "if" is required because if no .bad files exist
> the loop will still run once with file set to the literal "*.bad":
>    for file in *.bad ; do
>        if [ -e $file ] ; then
>            echo Bad
>        fi
>    done
>
> ------------------------------------------------------------------------
> Dan Ramaley                            Dial Center 118, Drake University
> Network Programmer/Analyst             2407 Carpenter Ave
> +1 515 271-4540                        Des Moines IA 50311 USA
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