Commands tagged ps1 sorted by votes

Commands tagged ps1 (7)

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Alias HEAD for automatic smart output

Run the alias command, then issue ps aux | head and resize your terminal window (putty/console/hyperterm/xterm/etc) then issue the same command and you'll understand. ${LINES:-`tput lines 2>/dev/null||echo -n 12`} Insructs the shell that if LINES is not set or null to use the output from `tput lines` ( ncurses based terminal access ) to get the number of lines in your terminal. But furthermore, in case that doesn't work either, it will default to using the deafault of 12 (-2 = 10). The default for HEAD is to output the first 10 lines, this alias changes the default to output the first x lines instead, where x is the number of lines currently displayed on your terminal - 2. The -2 is there so that the top line displayed is the command you ran that used HEAD, ie the prompt. Depending on whether your PS1 and/or PROMPT_COMMAND output more than 1 line (mine is 3) you will want to increase from -2. So with my prompt being the following, I need -7, or - 5 if I only want to display the commandline at the top. ( https://www.askapache.com/linux/bash-power-prompt/ ) 275MB/748MB [7995:7993 - 0:186] 06:26:49 Thu Apr 08 [askapache@n1-backbone5:/dev/pts/0 +1] ~ In most shells the LINES variable is created automatically at login and updated when the terminal is resized (28 linux, 23/20 others for SIGWINCH) to contain the number of vertical lines that can fit in your terminal window. Because the alias doesn't hard-code the current LINES but relys on the $LINES variable, this is a dynamic alias that will always work on a tty device. Show Sample Output
This is sample output - yours may be different.
```
[7995:7993 - 0:2497] [askapache@n1-backbone5:pts/0 +1] ~ $ lsof -a -d 1 -d 0-4 -w|head
COMMAND   PID USER   FD   TYPE DEVICE  SIZE       NODE NAME
bash     7995 askapache    0u   CHR  136,0                2 /dev/pts/0
bash     7995 askapache    1u   CHR  136,0                2 /dev/pts/0
bash     7995 askapache    2u   CHR  136,0                2 /dev/pts/0
[7995:7993 - 0:2497] [askapache@n1-backbone5:pts/0 +1] ~ $

[7995:7993 - 0:2497] [askapache@n1-backbone5:pts/0 +1] ~ $ lsof -a -d 1 -d 0-4 -w|head
COMMAND   PID USER   FD   TYPE DEVICE  SIZE       NODE NAME
bash     7995 askapache    0u   CHR  136,0                2 /dev/pts/0
bash     7995 askapache    1u   CHR  136,0                2 /dev/pts/0
bash     7995 askapache    2u   CHR  136,0                2 /dev/pts/0
bash     9305 askapache    0u   CHR  136,2                4 /dev/pts/2
bash     9305 askapache    1u   CHR  136,2                4 /dev/pts/2
bash     9305 askapache    2u   CHR  136,2                4 /dev/pts/2
lsof    17475 askapache    0u   CHR  136,0                2 /dev/pts/0
lsof    17475 askapache    1w  FIFO    0,6       1056477120 pipe
lsof    17475 askapache    2u   CHR  136,0                2 /dev/pts/0
lsof    17475 askapache    3r   DIR   0,96     0          1 /proc
lsof    17475 askapache    4r   DIR   0,96     0 1078132745 /proc/17475/fd
[7995:7993 - 0:2497] [askapache@n1-backbone5:pts/0 +1] ~ $
```
27

alias head='head -n $((${LINES:-`tput lines 2>/dev/null||echo -n 12`} - 2))'

AskApache · 2010-04-08 22:37:06 16
hanukkah colored bash prompt

blue and yellow colored bash prompt for a Hanukkah celebration on your box
This is sample output - yours may be different.
3

export PS1="\e[0;34m[\u\e[0;34m@\h[\e[0;33m\w\e[0m\e[0m\e[0;34m]#\e[0m "

decept · 2009-12-13 18:35:06 10

Command to Show a List of Special Characters for bash prompt (PS1)

I use this command (PS1) to show a list bash prompt's special characters. I tested it against A flavor of Red Hat Linux and Mac OS X Show Sample Output

This is sample output - yours may be different.

$ PS1
              \a     an ASCII bell character (07)
              \d     the  date in "Weekday Month Date" format (e.g., "Tue May
                     26")
              \D{format}
                     the format is passed to strftime(3) and  the  result  is
                     inserted into the prompt string; an empty format results
                     in a locale-specific time  representation.   The  braces
                     are required
              \e     an ASCII escape character (033)
              \h     the hostname up to the first '.'
              \H     the hostname
              \j     the number of jobs currently managed by the shell
              \l     the basename of the shell's terminal device name
              \n     newline
              \r     carriage return
              \s     the  name  of the shell, the basename of $0 (the portion
                     following the final slash)
              \t     the current time in 24-hour HH:MM:SS format
              \T     the current time in 12-hour HH:MM:SS format
              \@     the current time in 12-hour am/pm format
              \A     the current time in 24-hour HH:MM format
              \u     the username of the current user
              \v     the version of bash (e.g., 2.00)
              \V     the release  of  bash,  version  +  patch  level  (e.g.,
                     2.00.0)
              \w     the  current  working  directory, with $HOME abbreviated
                     with a tilde
              \W     the basename of  the  current  working  directory,  with
                     $HOME abbreviated with a tilde
              \!     the history number of this command
              \#     the command number of this command
              \$     if the effective UID is 0, a #, otherwise a $
              \nnn   the character corresponding to the octal number nnn
              \\     a backslash
              \[     begin a sequence of non-printing characters, which could
                     be used to embed a terminal control  sequence  into  the
                     prompt
              \]     end a sequence of non-printing characters

alias PS1="man bash | sed -n '/ASCII bell/,/end a sequence/p'"

haivu · 2010-01-15 23:39:28 5

Colour part of your prompt red to indicate an error

If the return code from the last command was greater than zero, colour part of your prompt red. The commands give a prompt like this: [user current_directory]$ After an error, the "[user" part is automatically coloured red. Tested using bash on xterm and terminal. Place in your .bashrc or .bash_profile.
This is sample output - yours may be different.
3

export PROMPT_COMMAND='if (($? > 0)); then echo -ne "\033[1;31m"; fi'; export PS1='[\[\]\u\[\033[0m\] \[\033[1;34m\]\w\[\033[0m\]]\$ '

quintic · 2010-08-25 21:19:30 4
Add the time to BASH prompt

Adds the time in 12hr AM/PM format to the beginning of a prompt. Change \@ to \t for 24-hour time or \T for 12hr without AM/PM. To keep the time the next time you open a terminal, edit ~/.bashrc and stick the command at the bottom. Show Sample Output
This is sample output - yours may be different.
```
(10:34 AM) [<user>@<host> <pwd>]$
```
1

export PS1="(\@) $PS1"

cmdq · 2010-11-22 04:50:21 6
Cool PS1 with host, time, path and user. With color!

A simple PS1, ready to be used. Just paste in your ~/.bashrc Show Sample Output
This is sample output - yours may be different.
```
[user@host | /etc/network 13:36:54]$ (fields in different colors)
```
0

export PS1="[\[\e[1;32m\]\u\[\e[m\]\[\e[1;31m\]@\[\e[m\]\[\e[3;35m\]\H\[\e[m\] \[\e[1;30m\]| \[\e[m\]\[\e[1;34m\]\w\[\e[m\] \[\e[1;29m\]\t\[\e[m\]]\[\e[1;33m\]$\[\e[m\]"

thelaser · 2017-03-24 14:21:20 18
Colour part of your prompt red to indicate an error
This is sample output - yours may be different.
-2

export PS1='[\[\e[36;1m\]\u@\[\e[32;1m\]\h \[\e[31;1m\]\w]# \[\e[0m\]'

bakhru · 2011-04-16 00:58:51 6

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escape any command aliases

e.g. if rm is aliased for 'rm -i', you can escape the alias by prepending a backslash: rm [file] # WILL prompt for confirmation per the alias \rm [file] # will NOT prompt for confirmation per the default behavior of the command

vim multiple files at one time, split vertically.

total text files in current dir

Take a screenshot of a login screen

when using Gnome or KDE, you will have a hard time getting a screenshot of something like a login screen, or any other screen that occurs before the desktop environment is up and monitoring the printscreen key. (this probably applies for other DEs as well, but I haven't used them) What this command is meant to do is take a screenshot of an X window using a command you can run from your virtual terminals (actual text terminals, not just an emulator) To do this: Press CTRL+ALT+F1 to go to a virtual (text) terminal once your login window comes up Login to the virtual terminal and enter the command (you'll have to type it in) You should now have a file called screenshot.png in your home directory with your screenshot in it. For those of you who are new to the virtual terminal thing, you can use CTRL+ALT+F7 to get back to your regular GUI From http://www.gnome.org

Delete all local git branches that have been merged

This checks if the branch has been merged with master and then will delete the ones that have been. Keeps your local git repo nice and clean from all the branches.

Easily decode unix-time (funtion)

find previously entered commands

Searches bash-history in reverse order (last entered commands first). Pressing ctrl+r again shows the next matching entry.

List all active access_logs for currently running Apache or Lighttpd process

Ever logged into a *nix box and needed to know which webserver is running and where all the current access_log files are? Run this one liner to find out. Works for Apache or Lighttpd as long as CustomLog name is somewhat standard. HINT: works great as input into for loop, like this: $ for i in `lsof -p $(netstat -ltpn|awk '$4 ~ /:80$/ {print substr($7,1,index($7,"/")-1)}')| awk '$9 ~ /access.log$/ {print $9| "sort -u"}'` ; do echo $i; done Very useful for triage on unfamiliar servers!

a function to find the fastest DNS server

http://public-dns.info gives a list of online dns servers. you need to change the country in url (br in this url) with your country code. this command need some time to ping all IP in list.

a simple bash one-liner to create php file and call php function

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Commands tagged ps1 (7)

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