ps1

This command succeeds $ PS1='$(date +%s) $ ' 1391380852 $ However if I add a newline it fails $ PS1='$(date +%s)\n$ ' bash: command substitution: line 1: syntax error near unexpected token `)' bash: command substitution: line 1: `date +%s)' If I use backticks it works $ PS1='`date +%s`\n$ ' 1391381008 $ but backticks are discouraged . So what is causing this error? GNU bash, version 4.2.45(6)-release You can disambiguate the parsing easily, to prevent hitting any such bug (though I can't reproduce it myself): PS1='$(date +%s)'$'\n$ ' This $'\n' syntax parses to a literal newline character,

Consider this PS1 PS1='\n${_:+$? }$ ' Here is the result of a few commands $ [ 2 = 2 ] 0 $ [ 2 = 3 ] 1 $ 1 $ The first line shows no status as expected, and the next two lines show the correct exit code. However on line 3 only Enter was pressed, so I would like the status to go away, like line 1. How can I do this? Here's a funny, very simple possibility: it uses the \# escape sequence of PS1 together with parameter expansions (and the way Bash expands its prompt). The escape sequence \# expands to the command number of the command to be executed. This is incremented each time a command has

Using a script, I was to change the prompt of the parent Bash shell. I have tried the following: PS1="Hello World > " This changes the prompt of the subshell, which the script is running in, but which command would I use to change the prompt of the parent shell. Any ideas? In all cases the parent shell must cooperate. The child process in a unix environment cannot influence the parent process without its cooperation. Try this in the subshell script changePrompt.sh : echo 'PS1="Hello World > "' And then call the script from the parent shell like this: eval "$(changePrompt.sh)" Or, a different

参照： https://www.cnblogs.com/tdcqma/p/6714492.html Mac终端的主机名称+用户名全部显示出来的话会可能显得特别长，影响整体美观，可以切换至root用户后 修改.bashrc文件进行格式化。 1. 终端中切换root用户 su - root 2. 修改/etc/bashrc文件中的PS1='\h:\W \u\$ '，其中\h代表主机名，\u代表用户名 # System-wide .bashrc file for interactive bash(1) shells. if [ -z "$PS1" ]; then return fi PS1='\h:\W \u\$ ' # Make bash check its window size after a process completes shopt -s checkwinsize [ -r "/etc/bashrc_$TERM_PROGRAM" ] && . "/etc/bashrc_$TERM_PROGRAM" alias ll='ls -al' 3. 比如修改成：PS1='abc:\W 123\$ ' ， 终端显示如下： ps:注意，如果担心修改错误在修改前最好先备份一下/etc/bashrc文件 cp /etc/bashrc /tmp 来源： https://www.cnblogs

I'm new to git and I'm trying to add the current git branch to my already existing prompt, which is defined as follows : RESET="\[\017\]" NORMAL="\[\033[0m\]" RED="\[\033[31;1m\]" YELLOW="\[\033[33;1m\]" WHITE="\[\033[37;1m\]" SMILEY="${WHITE}:)${NORMAL}" FROWNY="${RED}:(${NORMAL}" SELECT="if [ \$? = 0 ]; then echo \"${SMILEY}\"; else echo \"${FROWNY}\"; fi" export PS1="${RESET}${YELLOW}\u@\h${NORMAL} \`${SELECT}\` ${YELLOW}\w $(__git_ps1) >${NORMAL} " I tried it (by sourcing my .bashrc file again) and it seemed to work, but then I went on another branch and it did not update. How can I make

I am using Ubuntu and I am tired of this long prompts in bash when I am working with some deep directory hierarchy. So, I would like to tweak my PS1 to shorten the working directory part the following way: Currently I have: pajton@dragon:~/workspace/projects/project1/folder1/test$ and would like to have: pajton@dragon:~/workspace/.../folder1/test$ The truncating would occur if len($PWD) passes given threshold. I want to always keep the first path component and at least one last path component. Then as space permits, add more components taking from the right. This is what I have currently. It