Meaning of switches (see man page too): v verbose p ignore mode (permissions) o ignore owner, group t ignore time of modification Disadvantage: If you modify any linked file, this will propagate to all other files which occupy the same space. Show Sample Output
optionally you can add
|cut -d' ' -f2|uniq
to the end of the command line.
Bash only, no sed, no awk. Multiple spaces/tabs if exists INSIDE the line will be preserved. Empty lines stay intact, except they will be cleaned from spaces and tabs if any available.
Clean output, if used in scripts:
GET checkip.dyndns.org|grep -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}'
or
GET icanhazip.com
Show Sample Output
Alternative if "Lazy unmount" (umount -l) doesn't obey.
Alternative for NFS:
umount -f /media/sdb1
Use with caution: forcing to unmount a busy partition can cause data loss!
works in bash Show Sample Output
Output of this command is the difference of recursive file lists in two directories (very quick!).
To view differences in content of files too, use the command submitted by mariusbutuc (very slow!):
diff -rq path_to_dir1 path_to_dir2
Show Sample Output
Every 20 minutes test if host with IP 192.168.0.14 is 'dead' or not reachable. The line should be put in your crontab file.
Every 20 minutes ping host with IP address 192.168.0.14. If it's not 'alive' or not reachable, then display something eye-catching (here xeyes) on the desktop.
Hint for newbies: edit crontab with
crontab -e
You can compare directories on two different remote hosts as well:
diff -y <(ssh user1@host1 find /boot|sort) <(ssh user2@host2 find /boot|sort)
To avoid password-prompt on remote host just generate the rsa key locally and copy it to remote host:
ssh-keygen -t rsa
then
ssh you@server1 "mkdir .ssh"
then
scp .ssh/id_rsa.pub you@server1:; .ssh/authorized_keys2
If any changes have been made to the package while it was unpacked (ie, conffiles files in /etc modi‐fied), the new package will inherit the changes. This way you can make it easy to copy packages from one computer to another, or to recreate packages that are installed on your system, but no longer available elsewhere. Note: dpkg-repack will place the created package in the current directory. Show Sample Output
This command does the following: - converts any sequence of multiple spaces/tabs to one space only - completely removes any space(s)/tab(s) at the end of each line (If spaces and tabs are mixed in a sequence i.e. [tab][tab][space][tab], you have to execute this command twice!) Show Sample Output
Schematics: command [options] [paste your variable here] parameter command [options] [paste entire column of variables here] parameter ... (hard-code command "c" and parameter "e" according to your wishes: in example shown command = "cp -a" and parameter = "~") Features: - Quick exchange only variable part of a long command line - Make variable part to be an entire column of data (i.e. file list) - Full control while processing every single item Hints: Paste column of data from anywhere. I.e. utilize the Block Select Mode to drag, select and copy columns (In KDE Konsole with Ctrl+Alt pressed, or only Ctrl pressed in GNOME Terminal respectively). Disadvantages: You can paste only one single variable in a row. If there are more space separated variables in a row only first one will be processed, but you can arrange your variables in a column instead. To transpose rows to columns or vice versa look at Linux manual pages for 'cut' and 'paste'. TODO: - add edit mode to vary command "c" and parameter "e" on the fly - add one edit mode more to handle every list item different - add y/n/a (=All) instead of only y(=default)/n to allowed answers Disclaimer: The code is not optimized, only the basic idea is presented here. It's up to you to shorten code or extend the functionality. Show Sample Output
This alias is meant to append n (here is n=10) most recently used cd commands to the bottom of history file. This way you can easily change to one of previous visited directories simply by hitting 1-10 times arrow up key. Hint: You can make more aliases implying the same rule for any set of frequently used long and complex commands like: mkisof, rdesktop, gpg...
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