How to produce a PS1 prompt in bash or ksh93 similar to tcsh Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30pm US/Eastern) 2019 Community Moderator Election Results Why I closed the “Why is Kali so hard” questionbash equivalent of this use of tcsh “sched” command?Bash overwrites the first line, PS1 bash promptHow can avoid these spurious characters in my bash prompt?Show only current and parent directory in bash promptExecute command within current shell before every promptAlias for “cd” which shows current directory each time I change directories?Parameters in bash $PS1 variableHow do I display only the current directory while using powerline in the terminal prompt.?what shell is used to run a scriptprompt (PS1) doesn't update on bound command

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How to produce a PS1 prompt in bash or ksh93 similar to tcsh



Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30pm US/Eastern)
2019 Community Moderator Election Results
Why I closed the “Why is Kali so hard” questionbash equivalent of this use of tcsh “sched” command?Bash overwrites the first line, PS1 bash promptHow can avoid these spurious characters in my bash prompt?Show only current and parent directory in bash promptExecute command within current shell before every promptAlias for “cd” which shows current directory each time I change directories?Parameters in bash $PS1 variableHow do I display only the current directory while using powerline in the terminal prompt.?what shell is used to run a scriptprompt (PS1) doesn't update on bound command



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1















In tcsh, I have the default:



prompt [%m:%c3] %n%# 


which gives prompts like:



[woehler:hacking/c/hello] ajcarr% 


and



[woehler:~] ajcarr% 


In other words, the current directory and up to the next two above it in the path.



In ksh93 or bash, the substitution of $HOME by ~ is easy, as is extracting the name of just the current directory, but I have yet to find a way of replicating the %c3 behaviour of tcsh. At present in ksh93 I have:



[ajcarr@Woehler] hello $ 


and



[ajcarr@Woehler] ~ $ 


Does anyone have any suggestions about how to do this?










share|improve this question






























    1















    In tcsh, I have the default:



    prompt [%m:%c3] %n%# 


    which gives prompts like:



    [woehler:hacking/c/hello] ajcarr% 


    and



    [woehler:~] ajcarr% 


    In other words, the current directory and up to the next two above it in the path.



    In ksh93 or bash, the substitution of $HOME by ~ is easy, as is extracting the name of just the current directory, but I have yet to find a way of replicating the %c3 behaviour of tcsh. At present in ksh93 I have:



    [ajcarr@Woehler] hello $ 


    and



    [ajcarr@Woehler] ~ $ 


    Does anyone have any suggestions about how to do this?










    share|improve this question


























      1












      1








      1


      0






      In tcsh, I have the default:



      prompt [%m:%c3] %n%# 


      which gives prompts like:



      [woehler:hacking/c/hello] ajcarr% 


      and



      [woehler:~] ajcarr% 


      In other words, the current directory and up to the next two above it in the path.



      In ksh93 or bash, the substitution of $HOME by ~ is easy, as is extracting the name of just the current directory, but I have yet to find a way of replicating the %c3 behaviour of tcsh. At present in ksh93 I have:



      [ajcarr@Woehler] hello $ 


      and



      [ajcarr@Woehler] ~ $ 


      Does anyone have any suggestions about how to do this?










      share|improve this question
















      In tcsh, I have the default:



      prompt [%m:%c3] %n%# 


      which gives prompts like:



      [woehler:hacking/c/hello] ajcarr% 


      and



      [woehler:~] ajcarr% 


      In other words, the current directory and up to the next two above it in the path.



      In ksh93 or bash, the substitution of $HOME by ~ is easy, as is extracting the name of just the current directory, but I have yet to find a way of replicating the %c3 behaviour of tcsh. At present in ksh93 I have:



      [ajcarr@Woehler] hello $ 


      and



      [ajcarr@Woehler] ~ $ 


      Does anyone have any suggestions about how to do this?







      bash ksh prompt tcsh






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited 2 hours ago









      steeldriver

      38.1k45489




      38.1k45489










      asked 2 hours ago









      Alun CarrAlun Carr

      6612




      6612




















          2 Answers
          2






          active

          oldest

          votes


















          1














          For bash, you could achieve similar results by setting the PROMPT_DIRTRIM variable:



          $ PS1='[u@h] w$ '
          [schaller@r2d2] ~$ pwd
          /home/schaller
          [schaller@r2d2] ~$ PROMPT_DIRTRIM=3
          [schaller@r2d2] ~$ cd /home/schaller/tmp/513924/another/directory/here
          [schaller@r2d2] ~/.../another/directory/here$





          share|improve this answer






























            1














            In ksh93:



            PS1='$PWD#$PWD%?/*/*/*?/ $ '
            share/doc/libnl-3-dev $ _

            PS1='[$HOSTNAME%%.*:$PWD#$PWD%?/*/*/*?/] $USER% '
            [host:share/doc/libnl-3-dev] user% _


            If you want it to also replace $HOME with ~, something nastier[1] is needed:



            PS1='$(d=$PWD/#$HOME/"~";printf %s "$d#$d%?/*/*/*?/") $ '
            ~/w/maemo $ cd sb2-pathmaps
            w/maemo/sb2-pathmaps $ _


            This should also work in bash, though bash has its own prompt escapes (eg. h for $HOSTNAME%%.*) and path shortening mechanism (with PROMPT_DIRTRIM).



            zsh has prompt escapes quite similar but not identical to tcsh:



            zsh$ PS1='[%m:%3c] %n%# '
            [host:share/doc/libnl-3-dev] user% _


            [1] there may be some consolation in the fact that ksh93 doesn't fork() another process for subshells which contain only builtins, like that $( ...; printf ...) ;-)






            share|improve this answer

























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              2 Answers
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              2 Answers
              2






              active

              oldest

              votes









              active

              oldest

              votes






              active

              oldest

              votes









              1














              For bash, you could achieve similar results by setting the PROMPT_DIRTRIM variable:



              $ PS1='[u@h] w$ '
              [schaller@r2d2] ~$ pwd
              /home/schaller
              [schaller@r2d2] ~$ PROMPT_DIRTRIM=3
              [schaller@r2d2] ~$ cd /home/schaller/tmp/513924/another/directory/here
              [schaller@r2d2] ~/.../another/directory/here$





              share|improve this answer



























                1














                For bash, you could achieve similar results by setting the PROMPT_DIRTRIM variable:



                $ PS1='[u@h] w$ '
                [schaller@r2d2] ~$ pwd
                /home/schaller
                [schaller@r2d2] ~$ PROMPT_DIRTRIM=3
                [schaller@r2d2] ~$ cd /home/schaller/tmp/513924/another/directory/here
                [schaller@r2d2] ~/.../another/directory/here$





                share|improve this answer

























                  1












                  1








                  1







                  For bash, you could achieve similar results by setting the PROMPT_DIRTRIM variable:



                  $ PS1='[u@h] w$ '
                  [schaller@r2d2] ~$ pwd
                  /home/schaller
                  [schaller@r2d2] ~$ PROMPT_DIRTRIM=3
                  [schaller@r2d2] ~$ cd /home/schaller/tmp/513924/another/directory/here
                  [schaller@r2d2] ~/.../another/directory/here$





                  share|improve this answer













                  For bash, you could achieve similar results by setting the PROMPT_DIRTRIM variable:



                  $ PS1='[u@h] w$ '
                  [schaller@r2d2] ~$ pwd
                  /home/schaller
                  [schaller@r2d2] ~$ PROMPT_DIRTRIM=3
                  [schaller@r2d2] ~$ cd /home/schaller/tmp/513924/another/directory/here
                  [schaller@r2d2] ~/.../another/directory/here$






                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered 1 hour ago









                  Jeff SchallerJeff Schaller

                  45.2k1164147




                  45.2k1164147























                      1














                      In ksh93:



                      PS1='$PWD#$PWD%?/*/*/*?/ $ '
                      share/doc/libnl-3-dev $ _

                      PS1='[$HOSTNAME%%.*:$PWD#$PWD%?/*/*/*?/] $USER% '
                      [host:share/doc/libnl-3-dev] user% _


                      If you want it to also replace $HOME with ~, something nastier[1] is needed:



                      PS1='$(d=$PWD/#$HOME/"~";printf %s "$d#$d%?/*/*/*?/") $ '
                      ~/w/maemo $ cd sb2-pathmaps
                      w/maemo/sb2-pathmaps $ _


                      This should also work in bash, though bash has its own prompt escapes (eg. h for $HOSTNAME%%.*) and path shortening mechanism (with PROMPT_DIRTRIM).



                      zsh has prompt escapes quite similar but not identical to tcsh:



                      zsh$ PS1='[%m:%3c] %n%# '
                      [host:share/doc/libnl-3-dev] user% _


                      [1] there may be some consolation in the fact that ksh93 doesn't fork() another process for subshells which contain only builtins, like that $( ...; printf ...) ;-)






                      share|improve this answer





























                        1














                        In ksh93:



                        PS1='$PWD#$PWD%?/*/*/*?/ $ '
                        share/doc/libnl-3-dev $ _

                        PS1='[$HOSTNAME%%.*:$PWD#$PWD%?/*/*/*?/] $USER% '
                        [host:share/doc/libnl-3-dev] user% _


                        If you want it to also replace $HOME with ~, something nastier[1] is needed:



                        PS1='$(d=$PWD/#$HOME/"~";printf %s "$d#$d%?/*/*/*?/") $ '
                        ~/w/maemo $ cd sb2-pathmaps
                        w/maemo/sb2-pathmaps $ _


                        This should also work in bash, though bash has its own prompt escapes (eg. h for $HOSTNAME%%.*) and path shortening mechanism (with PROMPT_DIRTRIM).



                        zsh has prompt escapes quite similar but not identical to tcsh:



                        zsh$ PS1='[%m:%3c] %n%# '
                        [host:share/doc/libnl-3-dev] user% _


                        [1] there may be some consolation in the fact that ksh93 doesn't fork() another process for subshells which contain only builtins, like that $( ...; printf ...) ;-)






                        share|improve this answer



























                          1












                          1








                          1







                          In ksh93:



                          PS1='$PWD#$PWD%?/*/*/*?/ $ '
                          share/doc/libnl-3-dev $ _

                          PS1='[$HOSTNAME%%.*:$PWD#$PWD%?/*/*/*?/] $USER% '
                          [host:share/doc/libnl-3-dev] user% _


                          If you want it to also replace $HOME with ~, something nastier[1] is needed:



                          PS1='$(d=$PWD/#$HOME/"~";printf %s "$d#$d%?/*/*/*?/") $ '
                          ~/w/maemo $ cd sb2-pathmaps
                          w/maemo/sb2-pathmaps $ _


                          This should also work in bash, though bash has its own prompt escapes (eg. h for $HOSTNAME%%.*) and path shortening mechanism (with PROMPT_DIRTRIM).



                          zsh has prompt escapes quite similar but not identical to tcsh:



                          zsh$ PS1='[%m:%3c] %n%# '
                          [host:share/doc/libnl-3-dev] user% _


                          [1] there may be some consolation in the fact that ksh93 doesn't fork() another process for subshells which contain only builtins, like that $( ...; printf ...) ;-)






                          share|improve this answer















                          In ksh93:



                          PS1='$PWD#$PWD%?/*/*/*?/ $ '
                          share/doc/libnl-3-dev $ _

                          PS1='[$HOSTNAME%%.*:$PWD#$PWD%?/*/*/*?/] $USER% '
                          [host:share/doc/libnl-3-dev] user% _


                          If you want it to also replace $HOME with ~, something nastier[1] is needed:



                          PS1='$(d=$PWD/#$HOME/"~";printf %s "$d#$d%?/*/*/*?/") $ '
                          ~/w/maemo $ cd sb2-pathmaps
                          w/maemo/sb2-pathmaps $ _


                          This should also work in bash, though bash has its own prompt escapes (eg. h for $HOSTNAME%%.*) and path shortening mechanism (with PROMPT_DIRTRIM).



                          zsh has prompt escapes quite similar but not identical to tcsh:



                          zsh$ PS1='[%m:%3c] %n%# '
                          [host:share/doc/libnl-3-dev] user% _


                          [1] there may be some consolation in the fact that ksh93 doesn't fork() another process for subshells which contain only builtins, like that $( ...; printf ...) ;-)







                          share|improve this answer














                          share|improve this answer



                          share|improve this answer








                          edited 13 mins ago

























                          answered 1 hour ago









                          mosvymosvy

                          10.6k11338




                          10.6k11338



























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