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Commands tagged Text Processing

Commands tagged Text Processing from sorted by
Terminal - Commands tagged Text Processing - 36 results
function catv { egrep -v "^$|^#" ${*} ; }
2009-09-11 14:58:47
User: mobidyc
Functions: egrep
Tags: Text Processing conffiles
1
Up
Down
Output files without comments or empty lines

better integration.

works on all Unices

works one bash and ksh.

Show sample output | Comments (0) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
grep -PL "\t" -r . | grep -v ".svn" | xargs sed -i 's/\t/ /g'
2009-05-28 08:52:14
User: root
Functions: grep sed xargs
Tags: Text Processing
3
Up
Down
Replace all tabs with spaces in an application

Note that this assumes the application is an SVN checkout and so we have to throw away all the .svn files before making the substitution.

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fold -s -w 90 file.txt
2009-05-11 23:00:25
User: vincentp
Functions: fold
Tags: Text Processing wrap fold text longlines newline
11
Up
Down
wrap long lines of a text

wraps text lines at the specified width (90 here).

-s option is to force to wrap on blank characters

-b count bytes instead of columns

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nl filename | more
2009-05-04 07:35:16
User: haivu
Functions: nl
Tags: Text Processing
-2
Up
Down
Display a File with Line Number

The nl command lists the contents of a file where is each line is prefixed by a line number. For more information about this command, check out its man page. I tested under Mac OS X and Xubuntu 9.04

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:split <file>
2009-02-25 23:41:22
User: raphink
Tags: Text Processing vim
4
Up
Down
Load another file in vim

You can then switch from a file to another with ^W^W

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tail -1000 /some/file | vim -
2009-02-25 11:43:27
User: root
Functions: tail vim
Tags: Text Processing vim
16
Up
Down
Pipe STDOUT to vim

The hyphen tells vim to open from STDOUT - saves having to create temporary files.

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echo "foo bar" | sudo tee -a /path/to/some/file
2009-02-18 13:54:25
User: raphink
Functions: echo sudo tee
Tags: Text Processing tee
3
Up
Down
Add a line to a file using sudo

This is the solution to the common mistake made by sudo newbies, since

sudo echo "foo bar" >> /path/to/some/file

does NOT add to the file as root.

Alternatively,

sudo echo "foo bar" > /path/to/some/file

should be replaced by

echo "foo bar" | sudo tee /path/to/some/file

And you can add a >/dev/null in the end if you're not interested in the tee stdout :

echo "foo bar" | sudo tee -a /path/to/some/file >/dev/null
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grep -v "^\($\|#\)" <filenames>
2009-02-16 21:40:09
User: raphink
Functions: grep
Tags: Text Processing conffiles
2
Up
Down
Output files without comments or empty lines

Filter comments and empty lines in files. I find this very useful when trying to find what values are actually set in a very long example config file.

I often set an alias for it, like :

alias nocomment='grep -v "^\($\|#\)"'

Show sample output | Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate
diff dir1 dir2 | diffstat
2009-02-16 21:21:16
User: raphink
Functions: diff
Tags: Text Processing
0
Up
Down
See which files differ in a diff

See which files differ in a diff, and how many changes there are. Very useful when you have tons of differences.

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sed -i '10d' <somefile>
2009-02-16 15:05:29
User: raphink
Functions: sed
Tags: Text Processing
4
Up
Down
Delete line number 10 from file

Very useful when the ssh key of a host has changed and ssh refuses to connect to the machine, while giving you the line number that has changed in ~/.ssh/known_hosts.

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sed '1000000!d;q' < massive-log-file.log
2009-01-26 11:50:00
User: root
Functions: sed
Tags: Text Processing
17
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Efficiently print a line deep in a huge log file

Sed stops parsing at the match and so is much more effecient than piping head into tail or similar. Grab a line range using

sed '999995,1000005!d' < my_massive_file
Comments (1) | Add to favourites | Report as malicious | Submit alternative | Report as a duplicate