Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -g -O2 -fstack-protector-strong -Wformat
-Werror=format-security -Wall
uname output: Linux abyssal 6.4.0-3-amd64 #1 SMP PREEMPT_DYNAMIC Debian
6.4.11-1 (2023-08-17) x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu
Bash Version: 5.2
Patch Level: 15
Release Status: release
Description:
Bash gives a syntax error when using the $(...) form of
command substitution and timing grouped commands.
However, Bash works correctly when using the `...` form of
command substitution.
Repeat-By:
The 'time' built-in command can measure a group of commands
run in a subshell, for example:
$ time (date; sleep 1)
Thu Sep 7 05:19:21 AM PDT 2023
real 0m1.005s
user 0m0.003s
sys 0m0.001s
Attempting to save the output of time to a variable fails when
using $(...) command substitution. For example,
$ x=$( time ( date; sleep 1 ) 2>&1 )
-bash: syntax error near unexpected token `date'
However, old versions of bash (~2016) used to work correctly.
And, indeed, even the current version of bash works if one
uses backticks for command substitution.
$ x=` time ( date; sleep 1 ) 2>&1 `
$ # no error
There should be no difference between $(...) and `...`.
