Tip #181 Remove empty directories
To remove empty directories (even if filenames or dirnames contain spaces or weird characters) from a tree you can do:Read more »
Tip #180 Permanent bash history
Often I find myself using Ctrl-R in Bash to get an old command, only to find that too many days have passed and it's no longer in the .bash_history file.It is possible to increase the number of lines in the history file, but there can always be a moment when you'll need a long command from many months ago. The solution below uses the PROMPT_COMMAND variable, a command that bash executes before showing each prompt. Here are the two lines to add to your profile:
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- TAGS:
- history
- bash
- redirection
Tip #179 Disable bash history
Disable history for a particular account in bash with:(in home dir)
Read more »
- TAGS:
- history
- bash
- redirection
Tip #177 Copy and paste from the command line
Add the following alias and function to your profile to be able to copy and paste files at the command line:Read more »
Tip #175 Automatically do an ls after each cd
Add the following to your profile/bashrc etc:Read more »
- TAGS:
Tip #173 Count files by type
To find out the number of files of each type in your current directory try the following:Read more »
Tip #165 Directories and its size
which directories and trees take up all the diskspace?du -sm $(find /start/dir/* -type d -maxdepth 1 -xdev) | sort -g
If you want more human readable output try:
du -ha /var | sort -n -r | head -n 10
you want to see ALL directories in the tree
find $1 -type d | xargs du -sm | sort -g
To show all directories size including sub directories, type
du -h
To calculate the current directory size you are in (-s stand for summary)
du -sh
To show all the 1 level sub directories size (which you are not interested at sub sub directories.)
du -sh *
To show the size of specific directory
du -sh /home
To show the size of all sub directories of a specific directory
du -sh /home/* Read more »
Tip #172 Create daily backups
To create a set of backed up files with the current date added at the end of the file name try the following:Read more »
- TAGS:
- sed
alias aptitude at awk bash bc cal cat cd colrm comm cp csh curl cut date dd df dialog diff dirname dpkg du fc find fuser grep gs gzip history iconv kill ksh last less ln ls lsof lynx m4 md5sum mkdir mkfifo mkisofs mv mysql nc netstat openssl OSX perl ping popd ps pushd python read redirection rm scp screen sed sort ssh stat sudo svn tail tar tee test top tr uniq vim wc wget xargs