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Top Forums UNIX for Dummies Questions & Answers sed/grep string replace question Post 302366973 by Mike AAA on Saturday 31st of October 2009 06:16:54 AM
Old 10-31-2009
sed/grep string replace question

Hi all,

I know this question has probably been answered before, but I am struggling with this problem, even after googling a million pages.

In a file named rdmt.conf
I need a single character replaced, the number in the line below

CUR_OC4J_ID=1

It will always appear after CUR_OC4J_ID in the file.

ie replaced by:
CUR_OC4J_ID=2

I need to be able to toggle this value a few times in my script.

I can find the character via a grep:
CUR_OC4J_ID=$(grep CUR_OC4J_ID $SCRIPTDIR/rdmt.conf | cut -d= -f2)

But I cant work out how to replace it.

I have even created some test files. I can use the sed command to replace "hello" with "no" in a file, but when it gets to CUR_OC4J_ID it just spits out text saying the number in which i wanted it replaced to, and then when you look at the file, its not changed. I thought I could make it easier (but not neater) and just find the current value, and replace the whole line because I can put a variable in the sed command......


Any help would be appreciated, I know this is easy, but I have googled forever.

A sed command that doesn't depend on what number is after CUR_OC4J_ID would be the best/neatest solution.
 

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grep(1) 						      General Commands Manual							   grep(1)

Name
       grep, egrep, fgrep - search file for regular expression

Syntax
       grep [option...] expression [file...]

       egrep [option...] [expression] [file...]

       fgrep [option...] [strings] [file]

Description
       Commands  of  the family search the input files (standard input default) for lines matching a pattern.  Normally, each line found is copied
       to the standard output.

       The command patterns are limited regular expressions in the style of which uses a compact nondeterministic algorithm.  The command patterns
       are  full  regular  expressions.  The command uses a fast deterministic algorithm that sometimes needs exponential space.  The command pat-
       terns are fixed strings.  The command is fast and compact.

       In all cases the file name is shown if there is more than one input file.  Take care when using the characters $ * [ ^ | ( ) and   in  the
       expression because they are also meaningful to the Shell.  It is safest to enclose the entire expression argument in single quotes ' '.

       The command searches for lines that contain one of the (new line-separated) strings.

       The command accepts extended regular expressions.  In the following description `character' excludes new line:

	      A  followed by a single character other than new line matches that character.

	      The character ^ matches the beginning of a line.

	      The character $ matches the end of a line.

	      A .  (dot) matches any character.

	      A single character not otherwise endowed with special meaning matches that character.

	      A  string  enclosed in brackets [] matches any single character from the string.	Ranges of ASCII character codes may be abbreviated
	      as in `a-z0-9'.  A ] may occur only as the first character of the string.  A literal - must be placed where it can't be mistaken	as
	      a range indicator.

	      A  regular  expression  followed	by  an	* (asterisk) matches a sequence of 0 or more matches of the regular expression.  A regular
	      expression followed by a + (plus) matches a sequence of 1 or more matches of the regular expression.  A regular expression  followed
	      by a ? (question mark) matches a sequence of 0 or 1 matches of the regular expression.

	      Two regular expressions concatenated match a match of the first followed by a match of the second.

	      Two regular expressions separated by | or new line match either a match for the first or a match for the second.

	      A regular expression enclosed in parentheses matches a match for the regular expression.

       The  order  of  precedence  of  operators at the same parenthesis level is the following:  [], then *+?, then concatenation, then | and new
       line.

Options
       -b	   Precedes each output line with its block number.  This is sometimes useful in locating disk block numbers by context.

       -c	   Produces count of matching lines only.

       -e expression
		   Uses next argument as expression that begins with a minus (-).

       -f file	   Takes regular expression (egrep) or string list (fgrep) from file.

       -i	   Considers upper and lowercase letter identical in making comparisons and only).

       -l	   Lists files with matching lines only once, separated by a new line.

       -n	   Precedes each matching line with its line number.

       -s	   Silent mode and nothing is printed (except error messages).	This is useful for checking the error status (see DIAGNOSTICS).

       -v	   Displays all lines that do not match specified expression.

       -w	   Searches for an expression as for a word (as if surrounded by `<' and `>').  For further information, see only.

       -x	   Prints exact lines matched in their entirety only).

Restrictions
       Lines are limited to 256 characters; longer lines are truncated.

Diagnostics
       Exit status is 0 if any matches are found, 1 if none, 2 for syntax errors or inaccessible files.

See Also
       ex(1), sed(1), sh(1)

																	   grep(1)
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