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Full Discussion: If else - grep a string in a file
Top Forums Shell Programming and Scripting If else - grep a string in a file Post 302416862 by DeCoTwc on Wednesday 28th of April 2010 02:27:25 AM
Old 04-28-2010
Quote:
Originally Posted by rdcwayx
Code:
if grep "no rows selected" $OUTFILE
then
   cat $OUTFILE | mailx -s "[TESTING]Blocking sessions in $ORACLE_SID" $DBA
else
   echo "No session is blocked"
fi

I've never seen an if formatted quite like that. I tried it out, and I'm not sure I understand why you would want to do that. Wouldn't the grep display to the screen when you ran the script? And wouldn't that be a pain?

Code:
(02:23:01\[D@DeCoBox15)
[~]$ cat animals
cat
dog
hippo

(02:23:07\[D@DeCoBox15)
[~]$ cat p
#!/bin/bash

file=animals
if grep "$1" $file
then
echo "there is a $1"
else
echo "there is no $1"
fi


(02:23:10\[D@DeCoBox15)
[~]$ ./p dog
dog
there is a dog

(02:23:18\[D@DeCoBox15)
[~]$ ./p snake
there is no snake

Wouldn't it be better to just check that the grep returns something?

Code:
(02:26:07\[D@DeCoBox15)
[~]$ cat o
#!/bin/bash

file=animals
if [[ -n $(grep "$1" $file) ]];then
echo "there is a $1"
else
echo "there is no $1"
fi


(02:26:10\[D@DeCoBox15)
[~]$ ./o cat
there is a cat

(02:26:14\[D@DeCoBox15)
[~]$ ./o snake
there is no snake

 

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LEARN ABOUT SUSE

mlmmj-recieve

mlmmj-recieve(1)					      General Commands Manual						  mlmmj-recieve(1)

NAME

       mlmmj-recieve - recieve mails for an mlmmj managed mailinglist

SYNOPSIS

       mlmmj-recieve -L /path/to/listdir [-h] [-V] [-P] [-F]

       -h: This help

       -F: Don't fork in the background (debugging only)

       -L: Full path to list directory

       -P: Don't execute mlmmj-process (debugging only)

       -V: Print version

DESCRIPTION

       The  mlmmj-recieve  binary  is  the  one specified in the mailserver configuration file (aliases file), which writes the mail to the <list-
       dir>/incoming directory and invokes mlmmj-process unless  the  -P  option  is  specified.  On  systems  using  mailservers  supporting  the
       /etc/aliases file, a line to activate an mlmmj managed mailinglist would look like this:

       list: "|/usr/bin/mlmmj-recieve -L /var/spool/mlmmj/list/"

       It's very important to specify the full path to the binary, or the mailinglist will not function.

       When  the  -F  option is used, it will not fork in the background. The reason it forks is that if delivery of a mail takes longer time than
       the mail server will allow a command to be idle before presumed dead, the mail server would kill it.

SEE ALSO

       mlmmj-process(1)

AUTHORS

       This manual page was written by the following persons:

       Soren Boll Overgaard <boll@debian.org> (based on html2man output)

       Mads Martin Jorgensen <mmj@mmj.dk>

mlmmj-recieve							  September 2004						  mlmmj-recieve(1)
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