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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 - What does -- (double dash double hyphen) mean? - Unix . . . More precisely, a double dash (--) is used in most Bash built-in commands and many other commands to signify the end of command options, after which only positional ("non-option") arguments are accepted Example use: Let's say you want to grep a file for the string -v Normally -v will be considered the option to reverse the matching meaning (only show lines that do not match), but with -- you
What is the purpose of in a shell command? - Stack Overflow 180 command-line - what is the purpose of ? In shell, when you see $ command one command two the intent is to execute the command that follows the only if the first command is successful This is idiomatic of Posix shells, and not only found in Bash It intends to prevent the running of the second process if the first fails
What is the purpose of the : (colon) GNU Bash builtin? What is the purpose of a command that does nothing, being little more than a comment leader, but is actually a shell builtin in and of itself? It's slower than inserting a comment into your scripts
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
Bash Script : what does #! bin bash mean? - Stack Overflow That is called a shebang, it tells the shell what program to interpret the script with, when executed In your example, the script is to be interpreted and run by the bash shell Some other example shebangs are: (From Wikipedia) #! bin sh — Execute the file using sh, the Bourne shell, or a compatible shell #! bin csh — Execute the file using csh, the C shell, or a compatible shell #! usr