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 7
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 1

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 0

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 0
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 0
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 0
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 0

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grep binary (hexadecimal) patterns

-P activates the Perl regular expression mode.

Use a var with more text only if it exists

See "Parameter Expansion" in the bash manpage. They refer to this as "Use Alternate Value", but we're including the var in the at alternative.

Tar files matching a certain wildcard

This is a shortcut to tar up all files matching a wildcard. Tar doesn't have the --include (apparently).

Scan a document to PDF

Adjust the --resolution and --mode as required (if these options are available for your scanner). The size options (-x, -y, -imageheight, -imagewidth) are for US letter paper. For A4, I think the command would be: $scanimage -p --resolution 250 --mode Gray -x 210 -y 297 | pnmtops -imageheight 11.7 -imagewidth 8.3 | ps2pdf - output.pdf

check open ports without netstat or lsof

convert markdown to PDF

This is the one-line version of this htmldoc + markdown combo to convert markdown formatted text to PDF files to distribute to your non-savvy project managers. http://scottnesbitt.net/ubuntublog/?p=114

execute command on all files of certain types excluding folders that match pattern

Display Spinner while waiting for some process to finish

alternatively, run the spinner for 5 seconds: timeout 5 bash -c 'spinner=( Ooooo oOooo ooOoo oooOo ooooO oooOo ooOoo oOooo); while true; do for i in ${spinner[@]}; do for j in seq 0 ${#i}; do echo -en "\b\b"; done; echo -ne "${i}"; sleep 0.2; done; done'

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"

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Commands tagged ps1 (7)

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