Shopt -s histappend Post: 303037022

Sponsored Content

Top Forums UNIX for Advanced & Expert Users Shopt -s histappend Post 303037022 by Neo on Sunday 21st of July 2019 01:22:54 AM

07-21-2019

Administrator

I am not 100% sure, but I "think" it is there for some legacy backward compatibility issue.

On my systems, the history is always appended even when histappend is set to off.

For example, on macOS:

Code:

Tim$ shopt
cdable_vars    	off
cdspell        	off
checkhash      	off
checkwinsize   	on
cmdhist        	on
compat31       	off
dotglob        	off
execfail       	off
expand_aliases 	on
extdebug       	off
extglob        	off
extquote       	on
failglob       	off
force_fignore  	on
gnu_errfmt     	off
histappend     	off
histreedit     	off
histverify     	off
hostcomplete   	on
huponexit      	off
interactive_comments	on
lithist        	off
login_shell    	on
mailwarn       	off
no_empty_cmd_completion	off
nocaseglob     	off
nocasematch    	off
nullglob       	off
progcomp       	on
promptvars     	on
restricted_shell	off
shift_verbose  	off
sourcepath     	on
xpg_echo       	off

Linux:

Code:

# shopt
autocd         	off
cdable_vars    	off
cdspell        	off
checkhash      	off
checkjobs      	off
checkwinsize   	on
cmdhist        	on
compat31       	off
compat32       	off
compat40       	off
compat41       	off
compat42       	off
compat43       	off
complete_fullquote	on
direxpand      	off
dirspell       	off
dotglob        	off
execfail       	off
expand_aliases 	on
extdebug       	off
extglob        	on
extquote       	on
failglob       	off
force_fignore  	on
globasciiranges	off
globstar       	off
gnu_errfmt     	off
histappend     	off
histreedit     	off
histverify     	off
hostcomplete   	off
huponexit      	off
inherit_errexit	off
interactive_comments	on
lastpipe       	off
lithist        	off
login_shell    	on
mailwarn       	off
no_empty_cmd_completion	off
nocaseglob     	off
nocasematch    	off
nullglob       	off
progcomp       	on
promptvars     	on
restricted_shell	off
shift_verbose  	off
sourcepath     	on
xpg_echo       	off

In both example cases above, the history is appended and not overwritten even though it is shown to be "off".

Neo

View Public Profile for Neo

Visit Neo's homepage!

Find all posts by Neo

2 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

shopt -s nullglob

Hi, I am using BASH. In a directory there are files that match either of the following 2 patterns: *.L1A_AC* or S*.L1A_MLAC* I would like to write a script that will include a for loop, where for each file in the directory, a certain function will be performed. For example: for FILE in...

2. Shell Programming and Scripting

Bash 'shopt' doubt

Hi, I am using bash shell's extended pattern matching. What tweak the following code needs in order to get the expected output? shopt -s extglob f="a@b@_c@d@_e" echo "${f/@(@|@_)/__}" My expected output is: a__b__c__d__e but the actual output is: a__b@_c@d@_e # that is, how to...

2 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

shopt -s nullglob

Discussion started by: msb65

2. Shell Programming and Scripting

Bash 'shopt' doubt

Discussion started by: royalibrahim