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Full Discussion: Shopt -s histappend
Top Forums UNIX for Advanced & Expert Users Shopt -s histappend Post 303037022 by Neo on Sunday 21st of July 2019 01:22:54 AM
Old 07-21-2019
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".
 

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condor_convert_history(1)				      General Commands Manual					 condor_convert_history(1)

Name
       condor_convert_history Convert - the history file to the new format

Synopsis
       condor_convert_history[-help]

       condor_convert_historyhistory-file1[history-file2...]

Description
       As  of  Condor  version 6.7.19, the Condor history file has a new format to allow fast searches backwards through the file. Not all queries
       can take advantage of the speed increase, but the ones that can are significantly faster.

       Entries placed in the history file after upgrade to Condor 6.7.19 will automatically be saved in the new format. The new format adds infor-
       mation  to  the	string which distinguishes and separates job entries. In order to search within this new format, no changes are necessary.
       However, to be able to search the entire history, the history file must be converted  to  the  updated  format.	condor_convert_historydoes
       this.

       Turn the condor_schedddaemon off while converting history files. Turn it back on after conversion is completed.

       Arguments  to  condor_convert_historyare  the  history  files to convert. The history file is normally in the Condor spool directory; it is
       named  history . Since the history file is rotated, there may be multiple history files, and all of them should be converted. On Unix plat-
       form variants, the easiest way to do this is:

       cd `condor_config_val SPOOL`
       condor_convert_history  history*

       condor_convert_historymakes  a  back  up  of each original history files in case of a problem. The names of these back up files are listed;
       names are formed by appending the suffix  .oldver to the original file name. Move these back up files to a directory other than	the  spool
       directory. If kept in the spool directory, condor_historywill find the back ups, and will appear to have duplicate jobs.

Exit Status
       condor_convert_historywill exit with a status value of 0 (zero) upon success, and it will exit with the value 1 (one) upon failure.

Author
       Condor Team, University of Wisconsin-Madison

Copyright
       Copyright  (C)  1990-2012  Condor  Team,  Computer  Sciences Department, University of Wisconsin-Madison, Madison, WI. All Rights Reserved.
       Licensed under the Apache License, Version 2.0.

       See the Condor Version 7.8.2 Manualor http://www.condorproject.org/licensefor additional notices. condor-admin@cs.wisc.edu

								  September 2012					 condor_convert_history(1)
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