Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Return Number of Substitutions made by SED?

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Return Number of Substitutions made by SED?
# 1  
Old 10-15-2009
Return Number of Substitutions made by SED?
Hi guys,

Is there any way this can be done, or return whether any substitutions have been made?

thanks for any input.

skinnygav (using Bash shell)
Last edited by skinnygav; 10-15-2009 at 01:03 PM..
# 2  
Old 10-15-2009
Quote:
Is there any way this can be done, or return whether any substitutions have been made?
No way of getting the information from "sed" itself.
To find out whether the file has changed, try running "cksum" on the file before and after and compare the results.
# 3  
Old 10-15-2009
Quote:
Originally Posted by skinnygav
Is there any way this can be done, or return whether any substitutions have been made?

Use awk instead, The return value from gsub is the number of substitutions made:

Code:
{ num += gsub( pattern, "string" ) }
END { print num }

Last edited by cfajohnson; 10-15-2009 at 10:50 PM..
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

awk command to return only field with a number in it

What is an awk command to print only fields with a number in it?? Input file....... S,S,S,S,S,S,S,S,S 001S,S,S,S,S,S,S,S,S 00219S,23S,24S,43S,47S,S,S,S,S 00319S,10S,23S,41S,43S,47S,S,S,S 00423S,41S,43S,46S,47S,S,S,S,S 00510S,23S,24S,43S,46S,S,S,S,S 00610S,23S,43S,46S,47S,S,S,S,S... (2 Replies)
Discussion started by: garethsays
2 Replies

2. Shell Programming and Scripting

awk - Print column number that return value comes from

I have the following awk script that I am using to find the max value in the file and print results. awk 'BEGIN {MAX=-1E100} {for (x=2; x<=NF; x++) if ($x>MAX) {MAX = $x; C1 = $1}} END {print substr(C1,1,11), substr(C1,13,4), substr(C1,18,2), MAX}' ABC* Input (ABC*) ... (6 Replies)
Discussion started by: ncwxpanther
6 Replies

3. UNIX for Dummies Questions & Answers

Multiple substitutions in one expression using sed

Hi, I'm trying to get multiple substitutions in one expression using sed: echo "-foo-_-bar--foo-_bar_-_foo_bar_-foo_-_bar_-" | sed -e "s//-/g" So, as you can see I'm trying to replace all instances of _-, -_, -- with - (dash) I have provided bad example. The question is how to use multiple... (6 Replies)
Discussion started by: useretail
6 Replies

4. Shell Programming and Scripting

awk return number of entries

I have a string with the following information and want to return the number of entries enclosed by <> in awk <stdin>: N = 441 <0.369000018/0.569000006> <0.369000018/0.569000006> <0/1> (7 Replies)
Discussion started by: kristinu
7 Replies

5. Shell Programming and Scripting

How do I use sed to return only the serial number here?

I'd appreciate the help and explaining "which each switch/command does. Thanks in advance. 1742@3min# ./fmtopo|grep serial hc://:product-id=SUNW,Sun-Blade-2500:server-id=c3admin:serial=130B58E3146/motherboard=0/cpu=0 (2 Replies)
Discussion started by: LittleLebowski
2 Replies

6. UNIX for Dummies Questions & Answers

Search specific pattern in file and return number of occurence

Hi I want to search for a specific pattern in file Say ABC;HELLO_UNIX_WORLD;PQR ABC;HELLO_UNIX_WORLD_IS_NOT_ENOUGH;XYZ ABC;HELLO_UNIX_FORUM;LMN Pattern to search is : "HELLO_UNIX_*****" and not "HELLO_UNIX_***_***_" I mean after "HELLO_UNIX" there can only be one word.In this case... (2 Replies)
Discussion started by: dashing201
2 Replies

7. Shell Programming and Scripting

awk script to return the middle line number

I need an awk script that returns the 1st field of the line in the middle of a file. For example, if a file I have has 6 lines, I want it to return the 1st field on line number 3. If a file has 7 lines, I want the script to return the 1st field on line number 4. File1: 3 214 4 219 5 226 2... (8 Replies)
Discussion started by: jontjioe
8 Replies

8. Shell Programming and Scripting

Using Sed to perform multiple substitutions?

Hello I have the following output which is returned with the Month in text format instead of numerical. The output I receive is performed by using Rational Synergy CM software commands from the Unix command line and piping Unix commands on the end. bash-3.00$ ccm query -n... (4 Replies)
Discussion started by: Glyn_Mo
4 Replies

9. Shell Programming and Scripting

Want to trap script error and return line number of failure

Hey all UNIX nerds- I've built a shell script which runs pretty well- only I want it to have much better error trapping. (Like the kind I could apply to every shell script I write). I'm not a UNIX genius, and could really use a bit of help. The original script goes something like this: 1... (3 Replies)
Discussion started by: stevekerver
3 Replies

10. Shell Programming and Scripting

return number of rows selected

Hi all, i am doing a perl script to read from a db. I am able to retrieve the rows, but i am unable to return the number of rows selected. i tried $selectedrows = $sth->numrows; i got the error msg: Can't locate object method "numrows" via package "DBI::st" i changed it to $selectedrows =... (7 Replies)
Discussion started by: new2ss
7 Replies
Login or Register to Ask a Question