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 …

Oct 27, 2021 · The shell will try to create directory test and then, only if it was successful will try create file inside it. So you may interrupt a sequence of steps if one of them failed.

Feb 20, 2011 · When going through one shell script, I saw the term "$?". What is the significance of this term?

I want to redirect both standard output and standard error of a process to a single file. How do I do that in Bash?

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 …

I often come across $?, $0, $1, $2, etc in shell scripting. I know that $? returns the exit status of the last command: echo "this will return 0" echo $? But what do the others do? …

Nov 15, 2010 · 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 …

What is the Linux command to check the server OS and its version? I am connected to the server using shell.

Aug 30, 2010 · How do I know if a variable is set in Bash? For example, how do I check if the user gave the first parameter to a function? function a { # if $1 is set ? }

Mar 22, 2011 · The disadvantage of this method is that other users on the computer can read the password from tools like ps and that the password can become part of your shell history. A …