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shell - Difference between sh and Bash - Stack Overflow Shell - "Shell" is a program, which facilitates the interaction between the user and the operating system (kernel) There are many shell implementations available, like sh, Bash, C shell, Z shell, etc
Difference between ${} and $() in a shell script - Super User $(command) is “command substitution” As you seem to understand, it runs the command, captures its output, and inserts that into the command line that contains the $(…); e g , $ ls -ld $(date +%B) txt -rwxr-xr-x 1 Noob Noob 867 Jul 2 11:09 July txt ${parameter} is “parameter substitution” A lot of information can be found in the shell’s man page, bash (1), under the “ Parameter
shell - How to concatenate string variables in Bash - Stack Overflow A bashism is a shell feature which is only supported in bash and certain other more advanced shells 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
What are the special dollar sign shell variables? - Stack Overflow $! is the PID of the most recent background command $0 is the name of the shell or shell script Most of the above can be found under Special Parameters in the Bash Reference Manual Here are all the environment variables set by the shell For a comprehensive index, please see the Reference Manual Variable Index
shell - How can I compare numbers in Bash? - Stack Overflow BTW, in bash a semi-colon is a statement separator, not a statement terminator, which is a new-line So if you only have one statement on a line then the ; at end-of-line are superfluous Not doing any harm, just a waste of keystrokes (unless you enjoy typing semi-colons)
shell - How do I set a variable to the output of a command in Bash . . . But as bash is a shell, where the main goal is to run other unix commands and react on result code and or output ( commands are often piped filter, etc ), storing command output in variables is something basic and fundamental Therefore, depending on compatibility (posix) kind of output (filter (s)) number of variable to set (split or interpret)