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Meaning of =~ operator in shell script [duplicate] asked 12 years, 11 months ago modified 12 years ago viewed 96k times 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. There are many shell implementations available, like sh, bash, c shell, z shell, etc. 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 Mean in shell programming?this is the exit status of the last executed command For example the command true always returns a status of 0 and false always returns a status of 1 # echoes 0 false echo $ # echoes 1 from the manual (acessible by calling man bash in your shell) Expands to the exit status of the most recently executed foreground pipeline In man bash we can read in shell builtin commands section (online doc) The exit, logout, break, continue, let, and shift builtins accept and process. What can you do with the eval command There is no man page for it.