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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 with == as in C: $ (( 1==1 )); echo $? 0 $ (( 1==2 )); echo $? 1 (Note: 0 means true in the Unix sense and a failed test results in a non-zero number ) Using -eq inside of double parentheses is a syntax
The UNIX® Standard | www. opengroup. org Single UNIX Specification- “The Standard” The Single UNIX Specification is the standard in which the core interfaces of a UNIX OS are measured The UNIX standard includes a rich feature set, and its core volumes are simultaneously the IEEE Portable Operating System Interface (POSIX) standard and the ISO IEC 9945 standard
What does the line #! bin sh mean in a UNIX shell script? When you try to execute a program in unix (one with the executable bit set), the operating system will look at the first few bytes of the file These form the so-called "magic number", which can be used to decide the format of the program and how to execute it
In Unix, how do you remove everything in the current directory and . . . First, if you look at the rm command man page (man rm under most Unix) you notice that –r means "remove the contents of directories recursively" So, doing rm -r alone would delete everything in the current directory and everything bellow it
Setting environment variables in Linux using Bash Set a local and environment variable using Bash on Linux Check for a local or environment variables for a variable called LOL in Bash: $ set | grep LOL $ $ env | grep LOL $ Sanity check, no local or environment variable called LOL Set a local variable called LOL in local, but not environment So set it: $ LOL="so wow much code" $ set | grep LOL LOL='so wow much code' $ env | grep LOL