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Preserve tcsh history in multiple terminal windows

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8

3

How can we preserve or maintain the same history across multiple terminals?

The same question, but for bash shell , were discussed in the below link

Preserve bash history in multiple terminal windows

let me know the corresponding settings for tcsh shell ?

command-history tcsh

share|improve this question

edited Apr 13 '17 at 12:36

Community♦

1

asked Aug 30 '13 at 9:34

user1228191user1228191

32111 gold badge55 silver badges1010 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  For more information on tcsh's history, see man tcsh. Searching for history -S should jump you to the most relevant part.
  
  – Randall
  Dec 28 '17 at 21:05
  

  
  
  
  

add a comment | 

8

3

How can we preserve or maintain the same history across multiple terminals?

The same question, but for bash shell , were discussed in the below link

Preserve bash history in multiple terminal windows

let me know the corresponding settings for tcsh shell ?

command-history tcsh

share|improve this question

edited Apr 13 '17 at 12:36

Community♦

1

asked Aug 30 '13 at 9:34

user1228191user1228191

32111 gold badge55 silver badges1010 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  For more information on tcsh's history, see man tcsh. Searching for history -S should jump you to the most relevant part.
  
  – Randall
  Dec 28 '17 at 21:05
  

  
  
  
  

add a comment | 

How can we preserve or maintain the same history across multiple terminals?

The same question, but for bash shell , were discussed in the below link

Preserve bash history in multiple terminal windows

let me know the corresponding settings for tcsh shell ?

command-history tcsh

share|improve this question

edited Apr 13 '17 at 12:36

Community♦

1

asked Aug 30 '13 at 9:34

user1228191user1228191

32111 gold badge55 silver badges1010 bronze badges

share|improve this question

edited Apr 13 '17 at 12:36

Community♦

1

asked Aug 30 '13 at 9:34

user1228191user1228191

32111 gold badge55 silver badges1010 bronze badges

share|improve this question

edited Apr 13 '17 at 12:36

Community♦

1

asked Aug 30 '13 at 9:34

user1228191user1228191

32111 gold badge55 silver badges1010 bronze badges

edited Apr 13 '17 at 12:36

Community♦

1

edited Apr 13 '17 at 12:36

Community♦

1

asked Aug 30 '13 at 9:34

user1228191user1228191

32111 gold badge55 silver badges1010 bronze badges

asked Aug 30 '13 at 9:34

user1228191user1228191

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2 Answers
2

active

oldest

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7

These variables set the history to merge itself instead of overwrite, and not save duplicates:

set history=1000

set histdup=erase

set savehist=(1000 merge)

the secret sauce is this line:

alias precmd 'history -S; history -M'

which will save and merge your history prior to printing the prompt - i.e. after each command you type.

all of the above should be added to your .tcshrc file.

share|improve this answer

answered Apr 29 '15 at 5:02

IdanIdan

8611 silver badge22 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  When I added this alias precmd 'history -S; history -M' nothing occurred when I wrote any command. Is there something else that should be done?
  
  – Ayman Salah
  Mar 14 '17 at 11:53
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @AymanSalah what occurs is not obvious - it's the .history file (or histfile shell variable value, if set) getting written to disk. Without the precmd alias set, ls -l .history will show the .history file as a untouched. With precmd set as above, ls -l .history will show the updated timestamp and size, as it gets written with each command.
  
  – Randall
  Dec 28 '17 at 20:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Randall Thank you for pointing that out. I had problems then with the shell session. What you're saying is 100% correct.
  
  – Ayman Salah
  Jan 1 '18 at 9:53
  

  
  
  
  

add a comment | 

0

In addition to Idan answer, I want to add that alias precmd 'history -S; history -M' potentially can mess up the history file, since it also records SIGINT and EOF signal (Ctrl+C and Ctrl+D).

A better way would be save and merge current shell history before running a command, and save after a comment.

You can achieve it by this setup below instead, because the tcsh doesn't recognize SIGINT or EOF as a command.

alias precmd        "history -M"

alias postcmd       "history -S"

share|improve this answer

answered 1 hour ago

berong91berong91

111 bronze badge

New contributor

berong91 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

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7

These variables set the history to merge itself instead of overwrite, and not save duplicates:

set history=1000

set histdup=erase

set savehist=(1000 merge)

the secret sauce is this line:

alias precmd 'history -S; history -M'

which will save and merge your history prior to printing the prompt - i.e. after each command you type.

all of the above should be added to your .tcshrc file.

share|improve this answer

answered Apr 29 '15 at 5:02

IdanIdan

8611 silver badge22 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  When I added this alias precmd 'history -S; history -M' nothing occurred when I wrote any command. Is there something else that should be done?
  
  – Ayman Salah
  Mar 14 '17 at 11:53
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @AymanSalah what occurs is not obvious - it's the .history file (or histfile shell variable value, if set) getting written to disk. Without the precmd alias set, ls -l .history will show the .history file as a untouched. With precmd set as above, ls -l .history will show the updated timestamp and size, as it gets written with each command.
  
  – Randall
  Dec 28 '17 at 20:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Randall Thank you for pointing that out. I had problems then with the shell session. What you're saying is 100% correct.
  
  – Ayman Salah
  Jan 1 '18 at 9:53
  

  
  
  
  

add a comment | 

7

These variables set the history to merge itself instead of overwrite, and not save duplicates:

set history=1000

set histdup=erase

set savehist=(1000 merge)

the secret sauce is this line:

alias precmd 'history -S; history -M'

which will save and merge your history prior to printing the prompt - i.e. after each command you type.

all of the above should be added to your .tcshrc file.

share|improve this answer

answered Apr 29 '15 at 5:02

IdanIdan

8611 silver badge22 bronze badges

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  When I added this alias precmd 'history -S; history -M' nothing occurred when I wrote any command. Is there something else that should be done?
  
  – Ayman Salah
  Mar 14 '17 at 11:53
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @AymanSalah what occurs is not obvious - it's the .history file (or histfile shell variable value, if set) getting written to disk. Without the precmd alias set, ls -l .history will show the .history file as a untouched. With precmd set as above, ls -l .history will show the updated timestamp and size, as it gets written with each command.
  
  – Randall
  Dec 28 '17 at 20:21
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @Randall Thank you for pointing that out. I had problems then with the shell session. What you're saying is 100% correct.
  
  – Ayman Salah
  Jan 1 '18 at 9:53
  

  
  
  
  

add a comment | 

These variables set the history to merge itself instead of overwrite, and not save duplicates:

set history=1000

set histdup=erase

set savehist=(1000 merge)

the secret sauce is this line:

alias precmd 'history -S; history -M'

which will save and merge your history prior to printing the prompt - i.e. after each command you type.

all of the above should be added to your .tcshrc file.

share|improve this answer

answered Apr 29 '15 at 5:02

IdanIdan

8611 silver badge22 bronze badges

set history=1000

set histdup=erase

set savehist=(1000 merge)

alias precmd 'history -S; history -M'

share|improve this answer

answered Apr 29 '15 at 5:02

IdanIdan

8611 silver badge22 bronze badges

answered Apr 29 '15 at 5:02

IdanIdan

8611 silver badge22 bronze badges

answered Apr 29 '15 at 5:02

IdanIdan

8611 silver badge22 bronze badges

0

In addition to Idan answer, I want to add that alias precmd 'history -S; history -M' potentially can mess up the history file, since it also records SIGINT and EOF signal (Ctrl+C and Ctrl+D).

A better way would be save and merge current shell history before running a command, and save after a comment.

You can achieve it by this setup below instead, because the tcsh doesn't recognize SIGINT or EOF as a command.

alias precmd        "history -M"

alias postcmd       "history -S"

share|improve this answer

answered 1 hour ago

berong91berong91

111 bronze badge

New contributor

berong91 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

0

In addition to Idan answer, I want to add that alias precmd 'history -S; history -M' potentially can mess up the history file, since it also records SIGINT and EOF signal (Ctrl+C and Ctrl+D).

A better way would be save and merge current shell history before running a command, and save after a comment.

You can achieve it by this setup below instead, because the tcsh doesn't recognize SIGINT or EOF as a command.

alias precmd        "history -M"

alias postcmd       "history -S"

share|improve this answer

answered 1 hour ago

berong91berong91

111 bronze badge

New contributor

berong91 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

add a comment | 

In addition to Idan answer, I want to add that alias precmd 'history -S; history -M' potentially can mess up the history file, since it also records SIGINT and EOF signal (Ctrl+C and Ctrl+D).

A better way would be save and merge current shell history before running a command, and save after a comment.

You can achieve it by this setup below instead, because the tcsh doesn't recognize SIGINT or EOF as a command.

alias precmd        "history -M"

alias postcmd       "history -S"

share|improve this answer

answered 1 hour ago

berong91berong91

111 bronze badge

New contributor

berong91 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

alias precmd        "history -M"

alias postcmd       "history -S"

share|improve this answer

answered 1 hour ago

berong91berong91

111 bronze badge

New contributor

berong91 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

answered 1 hour ago

berong91berong91

111 bronze badge

New contributor

berong91 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.

answered 1 hour ago

berong91berong91

111 bronze badge