Apr 3, 2012 · The shell splits tokens based on the contents of the IFS environment variable. Its default value is \t\n; i.e., whitespace, tab, and newline. Expanding "$@" gives you a pristine copy of the arguments passed. Expanding $@ may not.

Try the following in the shell: ls somefile echo $? If somefile exists (regardless whether it is a file or directory), you will get the return value thrown by the ls command, which should be 0 (default "success" return value). If it doesn't exist, you should get a number other then 0. The exact number depends on the program.

I can't seem to be able to increase the variable value by 1. I have looked at tutorialspoint's Unix / Linux Shell Programming tutorial but it only shows how to add together two variables. I have tried the following methods but they don't work:

The above (along with many more forms of ${parameter…something_else} constructs) are discussed at greater length in the shell’s man page, bash(1). A Note on Quotes. Note that you should always quote shell variables unless you have a good reason not to, and you’re sure you know what you’re doing. By contrast, while braces can be ...

Sep 30, 2010 · Indeed, if you read the 'portable shell' guidelines for the autoconf tool or related packages, this notation — using '||' and '&&' — is what they recommend. I suppose you could even go so far as: I suppose you could even go so far as:

What is the difference between =, == and -eq in shell scripting? Is there any difference between the following?

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 distros), or certain other shells like the /bin/sh provided on FreeBSD. –

May 28, 2009 · For instance: on my Debian GNU/Linux, there is a standard shell called dash; I know many people who like to use another shell called ksh; and there is also a special tool called busybox with his own shell interpreter . For posix shell compatible answer, go to last part of this answer! Requested string. The string to be split in the above ...

compare_nums() { # Function to compare two numbers (float or integers) by using AWK. # The function will not print anything, but it will return 0 (if the comparison is true) or 1 # (if the comparison is false) exit codes, so it can be used directly in shell one liners.

May 29, 2018 · -gt is documented in the manual for test or [, or in your shell's manual if these are built-in utilities, as. n1 -gt n2. True if the integer n1 is algebraically greater than the integer n2; otherwise, false. (the above is taken from the POSIX standard text about the test utility)