Shell equality operators (=, ==, -eq) Asked 11 years, 11 months ago Modified 3 years, 5 months ago Viewed 646k times

May 8, 2012 · I understand the basic difference between an interactive shell and a non-interactive shell. But what exactly differentiates a login shell from a non-login shell? Can you give …

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 …

Dec 22, 2010 · What is the purpose of "&&" in a shell command? Asked 14 years, 10 months ago Modified 2 years, 5 months ago Viewed 683k times

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

The shell is the program which actually processes commands and returns output. Most shells also manage foreground and background processes, command history and command line editing.

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 am writing a shell script to run under the KornShell (ksh) on AIX. I would like to use the mkdir command to create a directory. But the directory may already exist, in which case I do not …

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

In shell programming, commands and arguments must be separated from each other by whitespace. Here, you see the equal sign with no whitespace, meaning this is a variable …