SHOPT useful for optional behavior

 Well, its really a kool little tool.

Lets say you want to  use "EXCLUDE MATCHES" in a cp or ls commend. Turn on extglob and have fun: 

---

WITH OUT extblog on
! shopt extglob
extglob         off

! ls
a.txt      ab.txt     abacab.txt abc.txt    abcab.txt  acab.txt   c.txt      ca.txt     cab.txt

 

TURN extblog on
! ls
a.txt      ab.txt     abacab.txt abc.txt    abcab.txt  acab.txt   c.txt      ca.txt     cab.txt

 

WITH extblog on
! shopt -s extglob

! ls  !(a*)
c.txt   ca.txt  cab.txt

! shopt -s histappend

---

 

 

# Disable options:! shopt -u mailwarn ! unset MAILCHECK 

 

NOTE: ALL shopt an be set with -s switch and unset with the -u switch.

 

Read up and enjoy! 

All these wonderful options: 

cdable_vars off
cdspell off
checkhash off
checkwinsize on
cmdhist on
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

tags: shopt  mailwarn  linux  osx  history  cdable_vars  cdspell  checkhash  checkwinsize  cmdhist  dotglob  execfail  expand_aliases  extdebug  extglob  extquote  failglob  force_fignore  gnu_errfmt  histappend  histreedit  histverify  hostcomplete  huponexit  interactive_commen  

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