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Replacing specific entry using sed

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# 8  
Old 01-12-2013
From pottery to green stuff - interesting. However, including solutions to others of your threads, try
Code:
$ F=apple
$ B=greenwood
$ OP=0.70
$ NP=1.20
$ sed "/$F.*$B/ s/$OP/$NP/" file
apple:greenwood:1.20:50
pear:sunshine:0.95:60
dragonfruit:moonshine:1.50:50

sed is extremely powerful, so taking your time sitting back and learning it is invaluable.
# 9  
Old 01-12-2013
If you want to replace specific field values then I recommend using awk instead of sed:
Code:
awk -F: -v oldfruit="apple" -v newfruit="orange" '$1==oldfruit{$1=newfruit}1' Fruits.txt

In above program I am using colon : as field separator and changing the value of specific field, 1st field $1
# 10  
Old 01-12-2013
Be careful - this will replace ALL apples with oranges, not only greenwood's!
# 11  
Old 01-12-2013
Oh, here is the modified program:
Code:
awk -F: -v oldfruit="apple" -v newfruit="orange" -v brand="greenwood" '$1==oldfruit&&$2==brand{$1=newfruit}1' OFS=: Fruits.txt

RudiC, thanks for pointing that out.
# 12  
Old 01-19-2013
Linux sed fid and replace example
Hello Guys ,

I am new to shell scripting.

Below is what i have for you guys

file name employee.txt where I have a ^M at the end of the file , i can remove ^M usind sed

Solution 1Example 1 :
Code:
sed 's/ ^M/ /gi' employee.txt

Solution 2 Example 2 : :
Code:
1,$s/ ^M/ /g

But here is a catch on 1 thing ,where we need to apply the same concept to a entire folder where we have more than 50 file having the same problem of ^M to be removed , how can we do that ?

Problem :
Code:
ls -lrt /root/sunny1/
                              
                               
-rw-r--r-- 1 root root  3325 Dec  7  2011 install.log.syslog
-rw-r--r-- 1 root root 26725 Dec  7  2011 install.log
-rw------- 1 root root   949 Dec  7  2011 anaconda-ks.cfg
-rw-r--r-- 1 root root  1071 Oct 30 20:13 emplst.sh
drwxr-xr-x 2 root root  4096 Dec 10 20:51 Desktop
-rw-r--r-- 1 root root  1669 Jan 10 17:53 natasha_access.sh
-rw-r--r-- 1 root root   108 Jan 10 17:54 natasha_others
-rw-r--r-- 1 root root   109 Jan 10 17:56 last_sasha.sh
-rw-r--r-- 1 root root   140 Jan 10 18:02 emplsts_1_4.sh
drwxr-xr-x 2 root root  4096 Jan 10 18:33 redhat
-rw-r--r-- 1 root root   812 Jan 10 18:37 emplsts.sh
-rw-r--r-- 1 root root    59 Jan 14 18:52 emp1.sh
-rw-r--r-- 1 root root   549 Jan 19 12:55 employee.txt
-rw-r--r-- 1 root root   549 Jan 19 13:14 n_employee.txt
-rw-r--r-- 1 root root   507 Jan 19 13:20 f_employee.txt
[root@localhost ~]#

Last edited by Scrutinizer; 01-19-2013 at 05:18 AM.. Reason: code tags
# 13  
Old 01-19-2013
@sunnyd1: Please start a new thread with your question..
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