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4

Sometimes I do things such as starting a sub-shell from vim with :sh. How do I know if I'm in a sub-shell where exit will just return me out one level, vs. being in the outermost shell where exit will log me out or close my session.

Is there some kind of Inception totem I can spin or something to know how many levels deep I am?

command-line

share|improve this question

asked 8 hours ago

WyckWyck

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• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Related at vi.stackexchange.com : How do I know i am in a shell from vi command :sh?
  
  – steeldriver
  2 hours ago
  

  
  
  
  

add a comment
 | 

4

Sometimes I do things such as starting a sub-shell from vim with :sh. How do I know if I'm in a sub-shell where exit will just return me out one level, vs. being in the outermost shell where exit will log me out or close my session.

Is there some kind of Inception totem I can spin or something to know how many levels deep I am?

command-line

share|improve this question

asked 8 hours ago

WyckWyck

12122 bronze badges

New contributor

Wyck is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Related at vi.stackexchange.com : How do I know i am in a shell from vi command :sh?
  
  – steeldriver
  2 hours ago
  

  
  
  
  

add a comment
 | 

Sometimes I do things such as starting a sub-shell from vim with :sh. How do I know if I'm in a sub-shell where exit will just return me out one level, vs. being in the outermost shell where exit will log me out or close my session.

Is there some kind of Inception totem I can spin or something to know how many levels deep I am?

command-line

share|improve this question

asked 8 hours ago

WyckWyck

12122 bronze badges

New contributor

Wyck is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

share|improve this question

asked 8 hours ago

WyckWyck

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Wyck is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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share|improve this question

asked 8 hours ago

WyckWyck

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asked 8 hours ago

WyckWyck

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asked 8 hours ago

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2 Answers
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4

You can use the command pstree. Here is example - currently I'm having only one open terminal window on WSL:

user@wsl:~$ pstree
init─┬─init───bash───pstree
 └─init

user@wsl:~$ bash

user@wsl:~$ sh

$ bash

user@wsl:~$ pstree
init─┬─init───bash───bash───sh───bash───pstree
 └─init

Within an actual Linux/Ubuntu environment the process tree will be more complicated. We can filter the tree by the option -s that will show the parents of a selected process. So our command could be pstree -s $$, where $$ is an environment variable that contains the current PID:

user@ubuntu:~$ pstree -s $$
systemd──lightdm──lightdm──upstart──gnome-terminal-──bash──pstree

user@ubuntu:~$ bash

user@ubuntu:~$ sh

$ bash

user@ubuntu:~$ pstree -s $$
systemd──lightdm──lightdm──upstart──gnome-terminal-──bash──bash──sh──bash──pstree

References:

• SuperUser: How to get parent PID of a given process in GNU/Linux from command line?


• HowtoForge: Linux pstree Command Tutorial for Beginners

share|improve this answer

edited 6 hours ago

answered 8 hours ago

pa4080pa4080

17.2k77 gold badges3535 silver badges8282 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Here is an ugly way how to count the levels: pstree -s $$ | grep -Po 'gnome-terminal----K.*' | sed 's/-+-grep//' | sed -r 's/[-]+/n/g' | wc -l.
  
  – pa4080
  6 hours ago
  
  

  
  
  
  

add a comment
 | 

2

Check the value of the SHLVL shell variable:

echo $SHLVL

Quoting from bash's manual page:

SHLVL Incremented by one each time an instance of bash is started.

It is also supported by zsh.

share|improve this answer

answered 3 hours ago

egmontegmont

5,29711 gold badge1212 silver badges2828 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  But sh is not counted, so the example given, with sh, would not have incremented SHLVL. Still, this is something that might be useful for those not switching shells too much
  
  – ubfan1
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ubfan1 unless there's an overriding vimrc definition, :sh defaults to the user's login shell I think (it's really an abbreviated form of :shell rather than the name of a specific shell binary)
  
  – steeldriver
  2 hours ago
  

  
  
  
  

add a comment
 | 

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4

You can use the command pstree. Here is example - currently I'm having only one open terminal window on WSL:

user@wsl:~$ pstree
init─┬─init───bash───pstree
 └─init

user@wsl:~$ bash

user@wsl:~$ sh

$ bash

user@wsl:~$ pstree
init─┬─init───bash───bash───sh───bash───pstree
 └─init

Within an actual Linux/Ubuntu environment the process tree will be more complicated. We can filter the tree by the option -s that will show the parents of a selected process. So our command could be pstree -s $$, where $$ is an environment variable that contains the current PID:

user@ubuntu:~$ pstree -s $$
systemd──lightdm──lightdm──upstart──gnome-terminal-──bash──pstree

user@ubuntu:~$ bash

user@ubuntu:~$ sh

$ bash

user@ubuntu:~$ pstree -s $$
systemd──lightdm──lightdm──upstart──gnome-terminal-──bash──bash──sh──bash──pstree

References:

• SuperUser: How to get parent PID of a given process in GNU/Linux from command line?


• HowtoForge: Linux pstree Command Tutorial for Beginners

share|improve this answer

edited 6 hours ago

answered 8 hours ago

pa4080pa4080

17.2k77 gold badges3535 silver badges8282 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Here is an ugly way how to count the levels: pstree -s $$ | grep -Po 'gnome-terminal----K.*' | sed 's/-+-grep//' | sed -r 's/[-]+/n/g' | wc -l.
  
  – pa4080
  6 hours ago
  
  

  
  
  
  

add a comment
 | 

4

You can use the command pstree. Here is example - currently I'm having only one open terminal window on WSL:

user@wsl:~$ pstree
init─┬─init───bash───pstree
 └─init

user@wsl:~$ bash

user@wsl:~$ sh

$ bash

user@wsl:~$ pstree
init─┬─init───bash───bash───sh───bash───pstree
 └─init

Within an actual Linux/Ubuntu environment the process tree will be more complicated. We can filter the tree by the option -s that will show the parents of a selected process. So our command could be pstree -s $$, where $$ is an environment variable that contains the current PID:

user@ubuntu:~$ pstree -s $$
systemd──lightdm──lightdm──upstart──gnome-terminal-──bash──pstree

user@ubuntu:~$ bash

user@ubuntu:~$ sh

$ bash

user@ubuntu:~$ pstree -s $$
systemd──lightdm──lightdm──upstart──gnome-terminal-──bash──bash──sh──bash──pstree

References:

• SuperUser: How to get parent PID of a given process in GNU/Linux from command line?


• HowtoForge: Linux pstree Command Tutorial for Beginners

share|improve this answer

edited 6 hours ago

answered 8 hours ago

pa4080pa4080

17.2k77 gold badges3535 silver badges8282 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Here is an ugly way how to count the levels: pstree -s $$ | grep -Po 'gnome-terminal----K.*' | sed 's/-+-grep//' | sed -r 's/[-]+/n/g' | wc -l.
  
  – pa4080
  6 hours ago
  
  

  
  
  
  

add a comment
 | 

You can use the command pstree. Here is example - currently I'm having only one open terminal window on WSL:

user@wsl:~$ pstree
init─┬─init───bash───pstree
 └─init

user@wsl:~$ bash

user@wsl:~$ sh

$ bash

user@wsl:~$ pstree
init─┬─init───bash───bash───sh───bash───pstree
 └─init

Within an actual Linux/Ubuntu environment the process tree will be more complicated. We can filter the tree by the option -s that will show the parents of a selected process. So our command could be pstree -s $$, where $$ is an environment variable that contains the current PID:

user@ubuntu:~$ pstree -s $$
systemd──lightdm──lightdm──upstart──gnome-terminal-──bash──pstree

user@ubuntu:~$ bash

user@ubuntu:~$ sh

$ bash

user@ubuntu:~$ pstree -s $$
systemd──lightdm──lightdm──upstart──gnome-terminal-──bash──bash──sh──bash──pstree

References:

• SuperUser: How to get parent PID of a given process in GNU/Linux from command line?


• HowtoForge: Linux pstree Command Tutorial for Beginners

share|improve this answer

edited 6 hours ago

answered 8 hours ago

pa4080pa4080

17.2k77 gold badges3535 silver badges8282 bronze badges

user@wsl:~$ pstree
init─┬─init───bash───pstree
 └─init

user@wsl:~$ bash

user@wsl:~$ sh

$ bash

user@wsl:~$ pstree
init─┬─init───bash───bash───sh───bash───pstree
 └─init

user@ubuntu:~$ pstree -s $$
systemd──lightdm──lightdm──upstart──gnome-terminal-──bash──pstree

user@ubuntu:~$ bash

user@ubuntu:~$ sh

$ bash

user@ubuntu:~$ pstree -s $$
systemd──lightdm──lightdm──upstart──gnome-terminal-──bash──bash──sh──bash──pstree

share|improve this answer

edited 6 hours ago

answered 8 hours ago

pa4080pa4080

17.2k77 gold badges3535 silver badges8282 bronze badges

answered 8 hours ago

pa4080pa4080

17.2k77 gold badges3535 silver badges8282 bronze badges

answered 8 hours ago

pa4080pa4080

17.2k77 gold badges3535 silver badges8282 bronze badges

2

Check the value of the SHLVL shell variable:

echo $SHLVL

Quoting from bash's manual page:

SHLVL Incremented by one each time an instance of bash is started.

It is also supported by zsh.

share|improve this answer

answered 3 hours ago

egmontegmont

5,29711 gold badge1212 silver badges2828 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  But sh is not counted, so the example given, with sh, would not have incremented SHLVL. Still, this is something that might be useful for those not switching shells too much
  
  – ubfan1
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ubfan1 unless there's an overriding vimrc definition, :sh defaults to the user's login shell I think (it's really an abbreviated form of :shell rather than the name of a specific shell binary)
  
  – steeldriver
  2 hours ago
  

  
  
  
  

add a comment
 | 

2

Check the value of the SHLVL shell variable:

echo $SHLVL

Quoting from bash's manual page:

SHLVL Incremented by one each time an instance of bash is started.

It is also supported by zsh.

share|improve this answer

answered 3 hours ago

egmontegmont

5,29711 gold badge1212 silver badges2828 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  But sh is not counted, so the example given, with sh, would not have incremented SHLVL. Still, this is something that might be useful for those not switching shells too much
  
  – ubfan1
  3 hours ago
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @ubfan1 unless there's an overriding vimrc definition, :sh defaults to the user's login shell I think (it's really an abbreviated form of :shell rather than the name of a specific shell binary)
  
  – steeldriver
  2 hours ago
  

  
  
  
  

add a comment
 | 

Check the value of the SHLVL shell variable:

echo $SHLVL

Quoting from bash's manual page:

SHLVL Incremented by one each time an instance of bash is started.

It is also supported by zsh.

share|improve this answer

answered 3 hours ago

egmontegmont

5,29711 gold badge1212 silver badges2828 bronze badges

echo $SHLVL

SHLVL Incremented by one each time an instance of bash is started.

share|improve this answer

answered 3 hours ago

egmontegmont

5,29711 gold badge1212 silver badges2828 bronze badges

answered 3 hours ago

egmontegmont

5,29711 gold badge1212 silver badges2828 bronze badges

answered 3 hours ago

egmontegmont

5,29711 gold badge1212 silver badges2828 bronze badges