how to use a command in sed s/match/replacement - Shell Programming and Scripting

AbhishekG · #1 (**permalink**) 06-10-2008

hi,

how can i make use of a command in the replacement segment..

cat a | sed '/^[[:digit:]*]\{3\}$/{
s/$.*$/REPLACEMENT/g
}'

suppose if I want to use a awk command in the replacement section , how to achieve that ?

Thanks

robotronic · #2 (**permalink**) 06-10-2008

Use backticks, double quotes and remove cat command (is useless):

Code:

sed "/^[[:digit:]*]\{3\}$/{
s/\(.*\)/`awk '{ blah blah blah }' awk_input_file.txt`/g
}" a

But I highly recommend to put the awk result into a variable and pass that variable in sed script, especially if the awk code is complex:

Code:

VAR=`awk '{ blah blah blah }' awk_input_file.txt`
sed "/^ ... $/s/.*/${VAR}/g" sed_input_file.txt

More UNIX and Linux Forum Topics You Might Find Helpful
Thread	Thread Starter	Forum	Replies	Last Post
Need Replacement for sed	dbsurf	Shell Programming and Scripting	0	01-25-2008 02:47 PM
Regarding Replacement	rajx	UNIX for Dummies Questions & Answers	2	05-22-2007 06:19 AM
variable replacement	ppass	Shell Programming and Scripting	4	06-01-2005 07:18 AM
Replacement using sed	handak9	UNIX for Dummies Questions & Answers	5	07-13-2004 08:28 AM
cpu replacement. help	IMPTRUE	UNIX for Dummies Questions & Answers	3	07-25-2003 05:40 AM

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode