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Full Discussion: [Solved] Last occurrence of a string
Top Forums Shell Programming and Scripting [Solved] Last occurrence of a string Post 302891768 by Don Cragun on Friday 7th of March 2014 09:08:53 PM
Old 03-07-2014
A simple way to do things like this is with ed or ex. Your requirement to
Quote:
add "file was changed by $appid" to newline
could be interpreted several ways. Assuming that what you meant was to add a new line containing that text after the last line in the file containing SR2-13451, the following does that (and also adds a timestamp saying when the file was updated):
Code:
#!/bin/ksh
file=${1:-file}
appid='J_ang_script'
ed -s "$file" <<EOF > /dev/null
        w $file.backup
        /pwddb=/s/\(pwddb=\)[^ ]*/\1PWDDB_Replacement/
        /pwdapp=/s/\(pwdapp=\)[^ ]*/\1PWDAPP_Replacement/
        1
        ?SR2-134561?a
file was change by $appid $(date)
.
        w
        q
EOF

Note that it saves a backup copy of your file before making any changes.

If the file data.txt contains:
Code:
SR2-134561
pwddb=Lar1wod (need to replace string after =)
SR2-134561
pwdapp=Wde2xe 
SR2-134561
SR2-134561

then running the above script with:
Code:
./script_name data.txt

will save the original contents of data.txt in data.txt.backup and change the contents of data.txtto:
Code:
SR2-134561
pwddb=PWDDB_Replacement (need to replace string after =)
SR2-134561
pwdapp=PWDAPP_Replacement
SR2-134561
SR2-134561
file was change by J_ang_script Fri Mar  7 18:06:06 PST 2014

 

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LEARN ABOUT OPENSOLARIS

shells

shells(4)							   File Formats 							 shells(4)

NAME

       shells - shell database

SYNOPSIS

       /etc/shells

DESCRIPTION

       The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser-
       shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root.

       A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by  the  routines
       which search the file. Blank lines are also ignored.

       The following default shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/ksh93, /bin/pfcsh, /bin/pfksh, /bin/pfsh,
       /bin/sh, /bin/tcsh, /bin/zsh, /sbin/jsh, /sbin/sh, /usr/bin/bash, /usr/bin/csh, /usr/bin/jsh, /usr/bin/ksh, /usr/bin/ksh93, /usr/bin/pfcsh,
       /usr/bin/pfksh, /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh, and /usr/sfw/bin/zsh. /etc/shells overrides the default list.

       Invalid shells in /etc/shells could cause unexpected behavior, such as being unable to log in by way of ftp(1).

FILES

       /etc/shells    list of shells on system

SEE ALSO

       vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4)

SunOS 5.11							    20 Nov 2007 							 shells(4)
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