Here 'perl' executed with assumption that it will be an input loop - like 'read file until end-of-file'.
That is done by the option -p. Else that option means to print out each processed line, and that makes it write it back
However, it would not work out without the option -i - 'in-place editing', as without that the perl would print it on screen.
After all, there is the main option: -e - tells to perl to execute a command, instead of looking for a file with commands.
So, perl has an execution command and the input loop file and is directed to process it into the same file.
Code:
printf '1,$ s/OLD/NEW/g\nw! infile\nq!'| ex - infile
Here the 'ex' editor is editing the 'infile' and writes result into the 'infile', mentioned after 'w!' in 'printf ...'
The printf is produces the set of the 'ex' commands: '1,$' - address range - from 1st line to the last one; the substitute command itself; \n - to make another command: w! <file> - so, write to the file <file>; again, new command - q! - quit.
So produced printf output is piped to 'ex'.
The ' - ' is to suppress ex output, or to run silently.
I guess nothing more need to be explained.
Last edited by alex_5161; 08-14-2009 at 04:23 PM..
Hi All,
I need to write a script to find all "*.sh" files in /home file system and if any string find "*.sh" files with the name vijay@gmail.com need to replace with vijay.bhaskar@gmail.com. I just understood about the find the command to search .sh files. Please help me on this.
find / -name... (3 Replies)
I have a file comp.pkglist which mention package version and release . In 'version change' and 'release change' line there are two versions 'old' and 'new' Version Change: --> Release Change: -->
cat comp.pkglist
Package list: nss-util-devel-3.28.4-1.el6_9.x86_64
Version Change: 3.28.4 -->... (1 Reply)
Dear all,
I want to find all the "," in my text file and then replace the commas to a tab. I found a script online but I don't know how to modify the script for my case. Any one can help? Thank you.
@echo off &setlocal
set "search=%1"
set "replace=%2"
set "textfile=Input.txt"
set... (2 Replies)
Hello Forum.
I have a file called abc.sed with the following commands;
s/1/one/g
s/2/two/g
...
I also have a second file called abc.dat and would like to substitute all occurrences of "1 with one", "2 with two", etc and create a new file called abc_new.dat
sed -f abc.sed abc.dat >... (10 Replies)
I have a file example.txt as follows :SomeTextGoesHere
$$TODAY_DT=20140818
$$TODAY_DT=20140818
$$TODAY_DT=20140818I need to automatically update the date (20140818) in the above file, by getting the new date as argument, using a shell script.
(It would even be better if I could pass... (5 Replies)
I have a file1 with different with multiple fields and records
File2 has 2 fields.
I want to find and replace strings in file1 based on file2 values (I Want an exact match i.e. for example: when searching for DT:3, Substr of DT:34 should not be matched)
File2:
DT:3 foo_err
DT:34 bar_frr... (8 Replies)
Dear all,
I need your help, I have file like this:
file1:23456
01910964830098775635
34567
01942809546554654323
67589
26546854368698023653
09778
58716868568576876878
08675
86178546154065406546
08573
54165843543054354305
.
.file2:
23456 25
34567 26
67589 27 (2 Replies)
Can someone tell me how I can do this?
e.g:
Say file1.txt contains:
today is monday
the 22 of
NOVEMBER
2010
and file2.txt contains:
the
11th
month
of
How do i replace the word NOVEMBER with (5 Replies)
Hi Everyone,
I am new to this forum and new to sed/awk programming too !!
I need to find particular string in file1(text file) and replace it with a value from another text file(file2) the file2 has only one line and the value to be replaced with is in the second column.
file 1:
(assert (=... (21 Replies)
