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Top Forums UNIX for Dummies Questions & Answers Works on command line but not in script Post 302501687 by anthonyjstewart on Friday 4th of March 2011 09:13:39 AM
Old 03-04-2011
EXAMPLE 1: COMMAND LINE STRING

Working command line command: grep -rl POP * | xargs sed -i 's/POP/MOM/g'

This command should access all files in the current directory that have POP in them. It should then replace all instances of POP with MOM.

There is no output except that the files that have the string POP in them have bene changed so they now have MOM in them.

EXAMPLE 2: SCRIPT BASED CHANGE

Below is the command line inside a script. The script runs, takes two parameters POP and MOM so you would run it like this:

Code:
bash findandreplace.sh POP MOM

./findandreplace.sh POP MOM

The contents of the script are below

Code:
#!/bin/bash
SHELL=/bin/bash
MAIL=/var/mail/root
PATH=/opt/local/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin

if [ -z "$1" ] || [ -z "$2" ]
then
  echo " "
  echo " "
  echo "Usage: findandreplace.sh string1 string2"
  echo " "
  echo "Example:  findandreplace.sh  begin  end"
  echo " "
  echo "This will find all instances of begin and replace with end"
  echo "within the current directory."
  echo " "
 exit -1
fi
grep -rl $1 * | xargs sed -i 's/$1/$2/g'



When I echo the command line above inside the script the command line is perfect. But it doesn't actually make the change.

Last edited by pludi; 03-04-2011 at 10:53 AM.. Reason: code tags please
 

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echo(1B)					     SunOS/BSD Compatibility Package Commands						  echo(1B)

NAME
echo - echo arguments to standard output SYNOPSIS
/usr/ucb/echo [-n] [argument] DESCRIPTION
echo writes its arguments, separated by BLANKs and terminated by a NEWLINE, to the standard output. echo is useful for producing diagnostics in command files and for sending known data into a pipe, and for displaying the contents of envi- ronment variables. For example, you can use echo to determine how many subdirectories below the root directory (/) is your current directory, as follows: o echo your current-working-directory's full pathname o pipe the output through tr to translate the path's embedded slash-characters into space-characters o pipe that output through wc -w for a count of the names in your path. example% /usr/bin/echo "echo $PWD | tr '/' ' ' | wc -w" See tr(1) and wc(1) for their functionality. The shells csh(1), ksh(1), and sh(1), each have an echo built-in command, which, by default, will have precedence, and will be invoked if the user calls echo without a full pathname. /usr/ucb/echo and csh's echo() have an -n option, but do not understand back-slashed escape characters. sh's echo(), ksh's echo(), and /usr/bin/echo, on the other hand, understand the black-slashed escape characters, and ksh's echo() also understands a as the audible bell character; however, these commands do not have an -n option. OPTIONS
-n Do not add the NEWLINE to the output. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWscpu | +-----------------------------+-----------------------------+ SEE ALSO
csh(1), echo(1), ksh(1), sh(1), tr(1), wc(1), attributes(5) NOTES
The -n option is a transition aid for BSD applications, and may not be supported in future releases. SunOS 5.10 3 Aug 1994 echo(1B)
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