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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
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
What does $# mean in shell? - Unix Linux Stack Exchange What does $# mean in shell? I have code such as if [ $# -eq 0 ] then I want to understand what $# means, but Google search is very bad for searching these kinds of things
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
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)