Bash scripting: Diference between "$(command)" and `command`

Question

Possible Duplicate:
Command substitution: backticks or dollar sign / paren enclosed?

I want know the difference between use

var="$(command)"

and

var=`command`

in bash scripting, aparently are two ways to get the same result, but is possible that exist some diferences.

Flagged as a dup of http://stackoverflow.com/questions/9405478/command-substitution-backticks-or-dollar-sign-paren-enclosed — Art Taylor, Jan 04 '13 at 05:05
Thanks you and sorry for duplicate, I dont know that it is too called "substitution" and forget look with something words similar to that. Thanks you again... — Carlos Rincón Velásquez, Jan 04 '13 at 14:34
No problem. It's a pain to find by searching if you haven't seen it before. — Art Taylor, Jan 05 '13 at 18:32

score 1 · Answer 1 · answered Jan 04 '13 at 05:04

1

The first is better, as you can nest the command substitutions and it doesn't become awkward.

Further Reading.

answered Jan 04 '13 at 05:04

alex

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score 1 · Answer 2 · answered Jan 04 '13 at 05:05

From bash man page:

When the old-style backquote form of substitution is used, backslash retains its literal meaning except when followed by ‘$’, ‘`’, or ‘\’. The first backquote not preceded by a backslash terminates the command substitution. When using the $(command) form, all characters between the parentheses make up the command; none are treated specially.

(more interesting things there; do read the whole thing :) )

Bash scripting: Diference between "$(command)" and `command`

2 Answers2