A lot of information can be found in the shell’s man page, bash (1), under the “ parameter. E. g. , $ ls -ld $(date +%b). txt -rwxr-xr-x 1 noob noob 867 jul 2 11:09 july. txt ${parameter} is “parameter substitution”. $(command) is “command substitution”. It will not work under busybox sh or dash (which is /bin/sh on a lot of distros), or certain other shells like the /bin/sh provided on freebsd. · shell - shell is a program, which facilitates the interaction between the user and the operating system (kernel). · what does a dollar sign followed by an at-sign (@) mean in a shell script? There are many shell implementations available, like sh, bash, c shell, z shell, etc. · a bashism is a shell feature which is only supported in bash and certain other more advanced shells. Shell equality operators (=, ==, -eq) asked 11 years, modified 3 years, viewed 636k times As you seem to understand, it runs the command, captures its output, and inserts that into the command line that contains the $(…);
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A lot of information can be found in the shell’s man page, bash (1), under the “ parameter. E. g. , $ ls -ld $(date...
