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Top Forums Shell Programming and Scripting Bash script to extract paragraph with globs in it Post 302992550 by dsid on Monday 27th of February 2017 09:39:04 AM
Old 02-27-2017
Hi drysdalk,

I modified your script and ran it again. I have a doubt that it is to do something with my permissions or selinux or something. I created the temp file manually under /tmp but when trying to create it through the script, it gave me an error. As a result, I removed all the substitutions and put in the file names directly, and this time they worked. But this is really stupid and confusing if I cant do that.

Code:
#!/bin/bash

input=/home/dsiddiqui/basic_bash/scripts/example.txt
#tmp=`/tmp/script.tmp`

temp=/home/dsiddiqui/basic_bash/scripts/tempfile
while read -r line
do
        case "$line" in
                "******* BEGIN MESSAGE *******")
                        echo "$line" > /home/dsiddiqui/basic_bash/scripts/tempfile
                        ;;
                "******* END MESSAGE *******")
                        echo "$line" >> /home/dsiddiqui/basic_bash/scripts/tempfile

                        if /bin/grep ^Original\ presentment\ Not\ Found\ \!$ /home/dsiddiqui/basic_bash/scripts/tempfile >/dev/null 2>/dev/null
                        then
                                /bin/cat /home/dsiddiqui/basic_bash/scripts/tempfile
                                echo
                        fi
                        ;;
                *)
                        echo "$line" >> /home/dsiddiqui/basic_bash/scripts/tempfile
                        ;;
        esac

done < $input


Regarding your suggestions, one thing for sure is BEGIN MESSAGE and the END MESSAGE will always occur as a block. No other lines will have the same words again as these are log messages for an application and it is not programmed like that.
 

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TEMPFILE(1)						      General Commands Manual						       TEMPFILE(1)

NAME
tempfile - create a temporary file in a safe manner SYNOPSIS
tempfile [-d DIR] [-p STRING] [-s STRING] [-m MODE] [-n FILE] [--directory=DIR] [--prefix=STRING] [--suffix=STRING] [--mode=MODE] [--name=FILE] [--help] [--version] DESCRIPTION
tempfile creates a temporary file in a safe manner. It uses tempnam(3) to choose the name and opens it with O_RDWR | O_CREAT | O_EXCL. The filename is printed on standard output. See tempnam(3) for the actual steps involved in directory selection. The directory in which to create the file might be searched for in this order (but refer to tempnam(3) for authoritative answers): a) In case the environment variable TMPDIR exists and contains the name of an appropriate directory, that is used. b) Otherwise, if the --directory argument is specified and appropriate, it is used. c) Otherwise, P_tmpdir (as defined in <stdio.h>) is used when appropriate. d) Finally an implementation-defined directory (/tmp) may be used. OPTIONS
-d, --directory DIR Place the file in DIR. -m, --mode MODE Open the file with MODE instead of 0600. -n, --name FILE Use FILE for the name instead of tempnam(3). The options -d, -p, and -s are ignored if this option is given. -p, --prefix STRING Use up to five letters of STRING to generate the name. -s, --suffix STRING Generate the file with STRING as the suffix. --help Print a usage message on standard output and exit successfully. --version Print version information on standard output and exit successfully. RETURN VALUES
An exit status of 0 means the temporary file was created successfully. Any other exit status indicates an error. BUGS
Exclusive creation is not guaranteed when creating files on NFS partitions. tempfile is deprecated; you should use mktemp(1) instead. EXAMPLE
#!/bin/sh #[...] t=$(tempfile) || exit trap "rm -f -- '$t'" EXIT #[...] rm -f -- "$t" trap - EXIT exit SEE ALSO
tempnam(3), mktemp(1) Debian 30 May 2011 TEMPFILE(1)
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