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  1. bash - What are the special dollar sign shell variables ... - Stack ...

    Sep 14, 2012 · In Bash, there appear to be several variables which hold special, consistently-meaning values. For instance, ./myprogram &; echo $! will return the PID of the process …

  2. bash - What is the purpose of "&&" in a shell command? - Stack …

    Dec 22, 2010 · $ 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 …

  3. bash - Shell equality operators (=, ==, -eq) - Stack Overflow

    It depends on the Test Construct around the operator. Your options are double parentheses, double brackets, single brackets, or test. If you use ((…)), you are testing arithmetic equality …

  4. An "and" operator for an "if" statement in Bash - Stack Overflow

    An "and" operator for an "if" statement in Bash Asked 12 years, 7 months ago Modified 12 months ago Viewed 972k times

  5. What do the -n and -a options do in a bash if statement?

    Nitpicking The switches -a and -n are not strictly part of a bash if statement in that the if command does not process these switches. What are primaries? I call them "switches", but the bash …

  6. What's the difference between <<, <<< and < < in bash?

    Sep 27, 2015 · What's the difference between <<, <<< and < < in bash?Here document << is known as here-document structure. You let the program know what will be the ending text, and …

  7. How to compare strings in Bash - Stack Overflow

    Feb 10, 2010 · How do I compare a variable to a string (and do something if they match)?

  8. arguments - What is $@ in Bash? - Stack Overflow

    Oct 10, 2010 · I reckon that the handle $@ in a shell script is an array of all arguments given to the script. Is this true? I ask because I normally use search engines to gather information, but I …

  9. bash - Difference between 'if -e' and 'if -f' - Stack Overflow

    Apr 18, 2012 · 59 $ man bash -e file True if file exists. -f file True if file exists and is a regular file. A regular file is something that isn't a directory, symlink, socket, device, etc.

  10. bash - Precedence of the shell logical operators &&, || - Unix

    From the bash manpage (edited)... Lists A list is a sequence of one or more pipelines separated by one of the operators ;, &, &&, or ││, and optionally terminated by one of ;, &, or . Of these …