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Force exit code 0
To force a command to return success, for example, an rm command that might fail but you don't care if it does, just add'||:' to the end rm nonexistantfile.txt||: This will force an -
Harvest adding ^M to files
In case you got problems with Harvest, this link might help you There's the full version in case you dont have a PDF viewer. Getting rid of unwanted^M character Posted by Ken Strobel -
Obtain a complete xml tag
This is an example XML file?xml version="1.0"? catalog book id="bk101" authorGambardella, Matthew/author titleXML Developer's Guide/title genreComputer/genre price44.95/price publish_date2000-10-01/publish_date descriptionAn in -
Search for ^M in files
When editing files in Windows, the resulting files will have^M control characters. Most of the time, this will render the file useless on Unix You can solve that easily using the dos2unix (or dos2ux -
Obtaining lines from a text file where a column has some value
You have file comma separated values. You need certain rows where a(some) specific column(s) has some value. awk -F',''($3~ "VALUE"){print$3}' File.csv awk -F',''($3~ "VALUE"){print$0}' File.csv awk -F -
How to know column headers positions
Use this perl command perl -e'{$file="test.txt";$lin=1;$sep=";"} print++$i."\t$_$/"foreach(split/$sep/,qx[head -$lin$file|tail -1])' Given a file with this text on the 1st line: Name -
Installing CPAN module with all dependencies
To stop CPAN from asking'yes/no' when installing a module, use this command. PERL_MM_USE_DEFAULT=1 perl -MCPAN -e'install My::Module' (Works in bash only) -
Append newline to files with incomplete last line
tail -1c FileName.ext| wc -l echo FileName.ext -
NFS on a VPS
You can't use regular NFS on a Virtual Private Server. For that, you must use UNFS. Install UNFS and configure NFS normally. -
Is my Solaris machine 32 or 64 bit?
Execute this command/usr/bin/isainfo -b -
Which directory is heavier
If you have lots of directories and want to know which one is heavier (has more MB of data) just use du (disk usage) Example dir_A+---A1+---A2+---A3+---B1 -
Unzip and CPAN
If you receive the following message in CPAN Cannot unzip, no unzip program available On a Debian based system, follow these steps to solve it sudo apt-get install unzip, whereis unzip (write down this -
X11 Forwarding
run ssh -X user@remoteip Remote machine[] xdm, xauth installed,/etc/ssh/ssh_config with ForwardX11Trusted yes or ForwardX11 yes, depending on how much you care about security. -
Find how much space is used by a directory
Go to the directory you want to weight with cd commands. And then execute. du -h -
How to fix numpad in ubuntu when it stops working
Ubuntu users (and possibly other GNOME users): Has your numpad randomly stopped working? This has happened to me, and a number of other Ubuntu users. It's really easy to fix. Go to System - Preferences -
Changing directories
cd:Go to your$HOME directory, cd -: (cd, space, and a dash) Go to the previous directory. (like going back in history in a browser), pushd directory:Store directory in a stack, popd:Pop a directory -
Determine if a file exists
The unix command test allows you to do that, among other things test -e Filename&& echo'YES'|| echo'NO' In my case, i tried to make a file list in a text file and check -
Perform a task on a whole directory
Those commands will work on the current dir and the subdirs too. find. -print| xargs digest -a md5 find. -print| egrep -v'^\.$'| xargs digest -a md5 find. -print| xargs touch -
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