Special Prompt Strings
\a
- The ASCII BEL character, which is octal
007 .
\e
- An ASCII Escape character, which is octal
033 .
\h
- The hostname, up to the first period.
\H
- The full hostname.
\n
- A newline character, which is octal
012 .
\r
- A carriage return character, which is octal
015 .
\t
- The current time in 24-hour
HH:MM:SS format.
\T
- The current time in 12-hour
HH:MM:SS format.
\u
- The current user’s username.
\w
- The current working directory, with
$HOME abbreviated with a tilde (~ ).
\nnn
- The character represented by the octal value
nnn .
\[
- Start a sequence of nonprinting characters, such as for highlighting or changing colour on a terminal.
\]
- End a sequence of nonprinting characters.
Example
# configure the Bash startup file ~/.bashrc
# - set prompt string: [time]user@host:path$
# - set prompt colour: blue if last return value is 0; red otherwise
PS1="\`if (( \$? == 0 )); then echo '\[\e[0;34m\][\t]\u@\h:\w\\$'
else echo '\[\e[0;31m\][\t]\u@\h:\w\$'; fi\` \[\e[m\]"
2022-01-29
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