Brace Expansion not working bash

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I am trying to use brace expansion in a bash script as follows.

#!/bin/bash
document_root="/var/www/www.example.com"
`chmod -R g+w $document_root/{../captcha,../files}`

this gives me the error

chmod: cannot access `/var/www/www.example.com/{../captcha,../files}': No such file or directory

but when I run this in a terminal it works just fine.

#!/bin/bash
document_root="/var/www/www.example.com"
chmod -R g+w $document_root/{../captcha,../files}
  1. Don't prefix a variable with $ when you are assigning to a variable, only when expanding
  2. You don't need the backticks around chmod, doing so treats the whole thing as a command

Brace Expansion not working bash, In bash 3.0+ (as well as zsh and ksh93), {1..40} will expand to the numbers from 1-40 (inclusive). In a POSIX shell like dash (which is typical of� Parameter expansion. Getting back to. echo ${month[3]} Here the braces {} are not being used as apart of a sequence builder, but as a way of generating parameter expansion. Parameter expansion involves what it says on the box: it takes the variable or expression within the braces and expands it to whatever it represents.

Have you tried this way?

#!/bin/bash
document_root="/var/www/www.example.com"
chmod -R g+w $document_root/{"../captcha","../files"}

Brace expansion not working in a script, Brace expansion is a mechanism by which arbitrary strings may be generated. expansion (see Filename Expansion), but the filenames generated need not exist . A correctly-formed brace expansion must contain unquoted opening and� If you are a Linux power user, you are probably working a lot with command shell both the command line interface (CLI) as well as shell scripts. Linux command line provides a lot of flexibility and powerful options when working with different commands: regular expressions, wildcards, meta characters, operators, file and i/o redirection, brace expansion etc etc.

Stumbled over this issue myself. In my case I was using set -eu command at some point of my script resulting in this particular issue. Fix was to add -B option like set -euB re-enabling brace expansion for it has been disabled for some reason though manual states it is enabled by default.

Brace Expansion (Bash Reference Manual), echo Front-{A,B,C}-Back. The brace expansion seems not to work. Why doesn't it work? PS. I'm running on Slackware 14.2 on a bash shell. Brace expansion is enabled via the "set -B" command and the "-B" command line option to the shell and disabled via "set +B" and "+B" on the command line. Mitch Frazier is an embedded systems programmer at Emerson Electric Co. Mitch has been a contributor to and a friend of Linux Journal since the early 2000s.

Brace Expansion doesn't work, Bash uses brace expansion to generate a sequence of strings from the and don't add any space between the items, otherwise brace expansion will not work. Bash does not apply any syntactic interpretation to the context of the expansion or the text between the braces. To avoid conflicts with parameter expansion, the string "${" is not considered eligible for brace expansion. A correctly-formed brace expansion must contain unquoted opening and closing braces, and at least one unquoted comma.

Bash brace expansion – Linux Hint, sh does not treat opening or closing braces specially when they appear as part of a word, and preserves them in the output. Bash removes braces from words as a � Working around the BASH brace expansion rule. Brace expansion in BASH is a neat way to build a Cartesian product, like all the combinations of a set of first names and a set of last names. Just put the sets inside curly braces as comma-separated lists. In the example below I'm separating the two parts of the product with a whitespace:

Bash - Brace Expansion {}, Is there something I'm missing, or does the shell just not work like this? Code: (18 :33:24\[D@DeCoWork15) [~]$ cat prac.sh #!/bin/bash x=(aa bb cc dd ee ff gg� brace expansion is also good for enumerated arguments (typically numbers) that is things like {1..5} First it is limited to Bash > version 3.2 some versions of MacOSX did not have such an advanced bash installed! If that is the case you may be better of using the “seq” command or function. echo {5..15} # forward can be negative numebrs

Comments
  • Is this a copy and paste or a retype? The result you are getting looks like you have quoted the brace expansion.
  • removing backqoutes gave the exact same result
  • oh sorry. It was a typo in the question not the actual code. corrected it.
  • What is the result of echo $BASH_VERSION
  • What do you see if you stick an echo infront of the chmod? Does it expand?
  • Ya, works here too. Brace expansion was introduced in 3.0-alpha so not sure what's up