安裝中文字典英文字典辭典工具!
安裝中文字典英文字典辭典工具!
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- shopt - How can I list Bashs options for the current shell? - Unix . . .
checking with shopt <shoptoption> only works with shopt shell options, e g it works for shopt nullglob, as nullglob is a shopt shell option However shopt pipefail fails, because pipefail is a set shell option To check a set shell option using the shopt command, use shopt -o <setoption>; e g shopt -o pipefail works –
- How do you get descriptions of the available `shopt` options?
What is the canonical way for accessing the local documentation on any available Shell Options builtin with shopt? I'm using Ubuntu 12 04 and can run help shopt to get a description of what shopt does: shopt: shopt [-pqsu] [-o] [optname ] Set and unset shell options I can list the various Shell Options and their values (shopt or shopt
- bash - Set and Shopt - Why Two? - Unix Linux Stack Exchange
shopt is the command that cannot accidentally be mistyped to do something other than affect shell options, and does only one thing, but is a Bashism Use it if you prefer the modern conventional "getopt" syntax that took hold in later years
- linux - what is the meaning of the following shell option - shopt -s . . .
This is explained in the bash manual and with help shopt in an interactive bash shell The specific options mentioned here are well documented in the bash manual, but in short they are nullglob : Filename globbing patterns that don't match any filenames are simply expanded to nothing rather than remaining unexpanded
- shopt works in command line, not found when run in a script
I'm writing a script to copy some files around, and trying to use shopt -s dotglob to enable cp to copy dotfiles like jshint and whatnot I can run shopt -s dotglob directly at a bash prompt wi
- bash - localize shopt options - Unix Linux Stack Exchange
The state of the shopt options is still changed globally in the example above – Max1 Commented Feb 14,
- bash - How can I prevent unsupported shopt options from causing . . .
shopt_exists { compgen -A shopt -X \!"$1" "$1" > dev null } if shopt_exists direxpand; then shopt -s direxpand fi This method avoids forking, which is slow on some environments such as Cygwin So does the straightforward 2> dev null, I don't think you can beat that on performance
- shopt - bash overrides the history even with histappend set to on . . .
Why shopt -s histappend doesn't make a difference? OS: [root@test ~]# cat etc *-release CentOS release 6
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