How to remove first/last character from a string using SED How to remove first/last character from a string using SED, Removing the last three characters from every filename, Removing first character from each filename/string, Removing last character from each filename/string
How to remove first/last character from a string using SED
In the context of having a list of files with .exe, .pdf, .jpg, .gif extensions and we need to remove these extensions, we need to use sed:
Using sed and regular expressions, we can replace characters in strings. In the last example I replaced any string in the form |one character followed by any other characters zero or more times| with the |any other characters 0 ore more times| .\(.*\) in regular expressions terms matches any string that starts with any single character, followed by any other character 0-1-2-3... times (the brakets are being escaped by backslay ). Sed replaces this string with a new string that contains everything else after the first character in the previous string.
Notice that in this last example the dot |one character| moved after |any other characters zero or more times|, resulting in the last character in the string (filename in this case).
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17 comment(s) to How to remove first/last character from a string using SED:
1. Re: How to remove first/last character from a string using SED
remove last point by diurnambule
at November 24th, 2011 - 04:49
and to remove last point (test.zip => test and not test.): sed 's/\(.*\)\..../\1/'
2. Re: How to remove first/last character from a string using SED
How to remove everything except the first characte by Nigel Smith
at October 12th, 2011 - 15:17
sed 's/\(.\).*/\1/'
3. Re: How to remove first/last character from a string using SED
Speed Optimised Regexp by Nathan Watson-Haigh
at August 04th, 2011 - 19:16
The sed part of your examples can be speed up by optimising the regexp as follows: Removing the last three characters from line cat files | sed 's/...$//' Removing first character from each line cat files | sed 's/^.//' Removing last character from each line cat files | sed 's/.$//'
4. Re: How to remove first/last character from a string using SED
how to display only last character from file by mahesh chadare
at July 14th, 2011 - 09:26
how to display only last character from file
5. Re: How to remove first/last character from a string using SED
Unix Admin by Imran Zamir
at April 20th, 2011 - 03:20
Very nice tutorial in fact, thx
6. Re: How to remove first/last character from a string using SED
Oracle Database Administrator by malik shahid
at February 10th, 2010 - 08:06
It is very helpful. but can you please explain the regular expression working logic
7. Re: How to remove first/last character from a string using SED
gopher by JohnC
at February 08th, 2010 - 04:44
Thanks very much .. saved a lot of time, not everybody is an expert in awk,sed etc!
8. Re: How to remove first/last character from a string using SED
Remove the character before the last character wi by Andrei
at November 04th, 2009 - 09:50
Remove the character before the last character with SED http://forum.ivorde.ro/remove-the-character-before-the-last-character-with-sed-shell-scripting-t40.html
9. Re: How to remove first/last character from a string using SED
qus.. by srutho
at November 04th, 2009 - 05:59
hw to delete the character before the last character in each line of a file????
10. Re: How to remove first/last character from a string using SED
sed by swap
at September 14th, 2009 - 05:03
how to remove last but one character in a line using sed
11. Re: How to remove first/last character from a string using SED
Mr. by Tinku
at September 13th, 2009 - 10:02
Question1:-How to remove/delete last but one character in everyline in a file using sed command. question2:-How to remove first character in everyline in a file using sed command. Questions3:-How to swap 3rd,4th words in a file using sed command
12. Re: How to remove first/last character from a string using SED
nice article by ujjwal b soni
at December 24th, 2008 - 04:43
Hi,
Its really a nice article !!!
Cheers,
Ujjwal B Soni
baroda, gujarat, india
13. Re: How to remove first/last character from a string using SED
@sekhar by admin
at November 04th, 2008 - 09:12
Check out this article: http://www.ivorde.ro/How_to_cut_out_first_last_n_characters_from_file_name-100.html It shows how to remove the first three lines from each file's name. It can easily be adapted to other tasks, if you need to.
14. Re: How to remove first/last character from a string using SED
how to apply the Command for Directory Files by sekhar
at October 17th, 2008 - 06:45
hii dude, of Course u'r scripts looks correct ,but i dont want to take input from the text files ,Instead of that my directory has so many files , and i need to cut the First three Characters from the Filenames.And the Operation should b Inplace(means the Next time i open the Directory it Should Contains the modified files ...
Thankq
15. Re: How to remove first/last character from a string using SED
cat "folder" ? by Nico
at September 18th, 2008 - 14:40
I get a whole lot of "No such file or directory" if I try to do this in a folder. I'm assuming you were doing this on a text file. What if you wanted to batch rename a whole bunch of files, taking out the first n characters?
16. Re: How to remove first/last character from a string using SED
To Aerouge by Andrei
at June 19th, 2008 - 10:33
You can use the above example also to remove first/last two/three and so on characters from a string. Just use dot(.) characters as more as the number of characters you want to remove or replace. URW
17. Re: How to remove first/last character from a string using SED
Great Tut... Kudos by Aerouge
at June 17th, 2008 - 10:48
You have no idea how hard it is to find an article on this topic... and once I found your´s I could stop searching! Great work, percise, good examples and really helpfull!
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