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Time Synchronisation with NTP
This is sample output - yours may be different.
2

ntpdate ntp.ubuntu.com pool.ntp.org

fitidavid · 2009-03-20 12:40:31 7
Sort files by size
This is sample output - yours may be different.
5

ls -l | sort -nk5

lme · 2009-03-20 12:28:34 39
Place the argument of the most recent command on the shell

When typing out long arguments, such as: cp file.txt /var/www/wp-content/uploads/2009/03/ You can put that argument on your command line by holding down the ALT key and pressing the period '.' or by pressing <ESC> then the period '.'. For example: cd 'ALT+.' would put '/var/www/wp-content/uploads/2009/03/ as my argument. Keeping pressing 'ALT+.' to cycle through arguments of your commands starting from most recent to oldest. This can save a ton of typing.
This is sample output - yours may be different.
351

'ALT+.' or '<ESC> .'

atoponce · 2009-03-20 11:36:04 84
Revert back all files currently checked out by Perforce SCM for edit
This is sample output - yours may be different.
1

ropened='p4 opened | awk -F# "{print \$1}" | p4 -x - revert'

Alexander · 2009-03-20 11:10:47 5
Print the list of all files checked out by Perforce SCM

Just type 'opened' and get all files currently opened for edit.
This is sample output - yours may be different.
0

alias opened='p4 opened | awk -F# "{print \$1}"'

Alexander · 2009-03-20 11:06:41 14
print date 24 hours ago
This is sample output - yours may be different.
4

date --date=yesterday

KeePon · 2009-03-20 10:56:32 7
Alias for displaying a process tree nicely

By 'pst' you can print out process tree with all details about all processes (including a command line, PID, and the current process you are running in). By 'pst username' you can get an information about processes belonging to the particular user 'username'. Show Sample Output
This is sample output - yours may be different.
```
...
  |-(events/6,32)
  |-(events/7,33)
  |-gam_server,3914
  |-gdm-binary,4670 -nodaemon
  |   `-gdm-binary,4766 -nodaemon
  |       |-Xorg,4771 :0 -br -audit 0 -auth /var/gdm/:0.Xauth -nolisten tcp vt7
  |       `-gdmgreeter,4786
  |-gdm-rh-security,4768
...
```
0

alias pst='pstree -Alpha'

Alexander · 2009-03-20 10:53:37 5
Quicker move to parent directory

Alias two dots to move to parent directory. Put it into your .bashrc or .profile file. Show Sample Output
This is sample output - yours may be different.
```
~/foo/ $ ..
~/ $
```
9

alias ..='cd ..'

eimantas · 2009-03-20 09:57:28 8
Gets the last string of previous command with !$

It helps you save a lot of writing :-) Show Sample Output
This is sample output - yours may be different.
```
vi abc.txt -> $cat !$ -> $ls -al !$
```
4

$mkdir mydir -> mv !$ yourdir -> $cd !$

Bluehive · 2009-03-20 09:00:28 12
Leave a comment when voting down..

I think it would be wise if anyone voting down left a comment indicating the reason for that action. Don't keep it to yourself. Thanks. Show Sample Output
This is sample output - yours may be different.
```
I voted down because <reason_for_voting_down>
```
-10

if [ "${vote}" = "down" ]; then echo leave comment; fi

JesusSuperstar · 2009-03-20 00:31:13 187
Count number of bytes that are different between 2 binary files
This is sample output - yours may be different.
1

cmp -l file1.bin file2.bin | wc -l

thallett · 2009-03-20 00:21:22 4
Show directories in the PATH, one per line

The output of "echo $PATH" is hard to read, this is much easier. The parentheses ensure that the change to the input field separator (IFS) only happens the the sub shell and not affecting the current shell. Show Sample Output
This is sample output - yours may be different.
```
/bin
/usr/X11R6/bin
/usr/sbin
/sbin
/usr/bin
.
```
3

( IFS=:; for p in $PATH; do echo $p; done )

haivu · 2009-03-19 22:45:47 8
Store mp3 playlist on variable and play with mpg123

On my music directory, I create variable that contains all mp3s files, then I play them with mpg123. -C options enable terminal control key, s for stop, p for pause, f for forward to next song.
This is sample output - yours may be different.
-1

PLAYLIST=$(ls -1) ; mpg123 -C $PLAYLIST

servermanaged · 2009-03-19 17:20:28 12
Add a line for your username in the /etc/sudoers file, allowing you to sudo in Fedora

I am new to linux, and I was trying to figure out why I could not sudo with my username in Fedora 10. This command, when run as root, will add a line to the sudoers file allowing the loginname supplied to sudo. The above line will require a password when you sudo, if you wish to sudo without password, use: echo 'loginname ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers instead. you have to run this command as su, and this is just an easier way of using visudo, just adds it right from the terminal.
This is sample output - yours may be different.
-14

echo 'loginname ALL=(ALL) ALL' >> /etc/sudoers

refrax · 2009-03-19 13:23:43 21
How many world writeable files on your system? (Mandriva Linux msec)

Mandriva Linux includes a security tool called "msec" (configurable via "draksec"). One of the many things it regularily checks for is world writeable files. If any are found, it writes the list to /var/log/security/writable.today. "wc -l" simply counts the number of lines in the file. This number should be low. Browse through /var/log/security/writable.today and consider if any of those files *need* to be world-writeable (and if not, modify the permissions. eg: "chmod o-w $file"). A large number of world-writeable files may indicate that umask is not correctly set in /etc/profile (or ${HOME}/.bash_profile) but could also indicate poor security configuration or even malicious activity. Show Sample Output
This is sample output - yours may be different.
```
# wc -l /var/log/security/writable.today
7 /var/log/security/writable.today
```
0

# wc -l /var/log/security/writable.today

mpb · 2009-03-19 12:25:52 7
find the longest command in your history
This is sample output - yours may be different.
3

history | perl -lane '$lsize{$_} = scalar(@F); if($longest<$lsize{$_}) { $longest = $lsize{$_}; print "$_"; };' | tail -n1

salparadise · 2009-03-19 02:52:30 6
Update your journal

prerequisite: mkdir ~/journal
This is sample output - yours may be different.
1

vi ~/journal/$(date +%F)

ar · 2009-03-18 23:31:13 4
colored prompt

It colors the machine name and current directory different colors for easy viewing.
This is sample output - yours may be different.
5

export PS1='\[\033[0;35m\]\h\[\033[0;33m\] \w\[\033[00m\]: '

kamiller · 2009-03-18 22:05:48 11
List the largest directories & subdirectoties in the current directory sorted from largest to smallest.
This is sample output - yours may be different.
8

du -k | sort -r -n | more

puddleglum · 2009-03-18 18:14:19 7
Clear the terminal screen
This is sample output - yours may be different.
191

ctrl-l

mrttlemonde · 2009-03-18 17:38:49 558
Decreasing the cdrom device speed

Decreasing the cdrom device speed may be more comfortable to watch films (for example)
This is sample output - yours may be different.
8

eject -x 4

mrttlemonde · 2009-03-18 16:25:11 6
Scan for new SCSI devices

Issues a scan command on the given scsi host adapter (ex. a fibre channel adapter, in the example above on host0). Output can be watched in the messages log or in "dmesg"
This is sample output - yours may be different.
3

echo "- - -" > /sys/class/scsi_host/host0/scan

angrox · 2009-03-18 15:26:42 9
Lists architecture of installed RPMs

Lists all installed RPM packages with name and architecture, which is useful to check for compability packages (+ required i386 packages) on a 64bit system. Show Sample Output
This is sample output - yours may be different.
```
sgml-skel noarch
update-alternatives noarch
desktop-file-utils x86_64
db-devel x86_64
```
2

rpm -qa --queryformat "%{NAME} %{ARCH}\n"

angrox · 2009-03-18 15:19:21 13
Resets terminal in its original state

Resets a scrambled terminal into its orignal state.
This is sample output - yours may be different.
0

^[c (ctrl-v esc-c)

angrox · 2009-03-18 15:15:24 13
Doing some floating point calculations with rounding (e.g. at the 3rd decimal)
This is sample output - yours may be different.
1

echo '123/7' |bc -l |xargs printf "%.3f\n"

mrttlemonde · 2009-03-18 14:20:32 5
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Keep track of diff progress

You're running a program that reads LOTS of files and takes a long time. But it doesn't tell you about its progress. First, run a command in the background, e.g. $ find /usr/share/doc -type f -exec cat {} + > output_file.txt Then run the watch command. "watch -d" highlights the changes as they happen In bash: $! is the process id (pid) of the last command run in the background. You can change this to $(pidof my_command) to watch something in particular.

Which processes are listening on a specific port (e.g. port 80)

swap out "80" for your port of interest. Can use port number or named ports e.g. "http"

Move cursor to end of line

diff will usually only take one file from STDIN. This is a method to take the result of two streams and compare with diff. The example I use to compare two iTunes libraries but it is generally applicable.

diff is designed to compare two files. You can also compare directories. In this form, bash uses 'process substitution' in place of a file as an input to diff. Each input to diff can be filtered as you choose. I use find and egrep to select the files to compare.

Get count of kilobytes brew cleanup would free

Use Perl like grep

If you've ever tried "grep -P" you know how terrible it is. Even the man page describes it as "highly experimental". This function will let you 'grep' pipes and files using Perl syntax for regular expressions. The first argument is the pattern, e.g. '/foo/'. The second argument is a filename (optional).

Find status of all symlinks

The symlinks command can show status of all symbolic links, including which links are dangling, which symlinks point to files on other file systems, which symlinks use ../ more than necessary, which symlinks are messy (e.g. having too many slashes or dots), etc. Other useful things it can do include removing all dangling links (-d) and converting absolute links to relative links (-c). The path given must be an absolute path (which is why I used $(pwd) in the example command).

automatically ditch old versions in a conflict

This is not exactly a commandline, but a vim macro to automatically ditch the "old" version of a conflict when dealing with the naster

Apply permissions only to files

To apply only to dirs: $ chmod 755 $(find . -type d) Use -R parameters for recursive walk.

Copy modification timestamp from one file to another.

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