bash - Shell equality operators (=, ==, -eq) - Stack Overflow 530 = and == are for string comparisons -eq is for numeric comparisons -eq is in the same family as -lt, -le, -gt, -ge, and -ne == is specific to bash (not present in sh (Bourne shell), ) Using POSIX = is preferred for compatibility In bash the two are equivalent, and in sh = is the only one that will work
Whats the difference between lt; lt;, lt; lt; lt; and lt; lt; in bash? 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 whenever that delimiter is seen, the program will read all the stuff you've given to the program as input and perform a task upon it Here's what I mean: $ wc << EOF > one two three > four five > EOF 2 5 24 In this example we
An and operator for an if statement in Bash - Stack Overflow Modern shells such as Bash and Zsh have inherited this construct from Ksh, but it is not part of the POSIX specification If you're in an environment where you have to be strictly POSIX compliant, stay away from it; otherwise, it's basically down to personal preference
shell - What does -ne mean in bash? - Stack Overflow It doesn't mean anything "in bash" [ runs a command called test -ne is an argument to the test command, not to bash, and you can find its documentation in man test
Whats the meaning of the parameter -e for bash shell command line? 123 I have as bash shell script with header #! bin bash -e When I run the script, it will be interrupted after the grep command runs, but when I remove the parameter -e, then the script can be run normally What is the meaning of parameter -e?
sh - [: missing `] in bash script - Stack Overflow The double-brace keyword is a bash expression, and will not work with other POSIX shells, but it has some benefits, as well, such as being able to do these kinds of operations more readably Of course, there are a lot of ways to test the number of arguments passed The mere existence of $2 will answer your question, as well
How to increment a variable in bash? - Ask Ubuntu #! bin bash # To focus exclusively on the performance of each type of increment # statement, we should exclude bash performing while loops from the # performance measure
Shell scripting: -z and -n options with if - Unix Linux Stack Exchange You can find a very nice reference for bash's [ aka test builtin's operators here, or by running help test in a bash shell or info bash test or info bash '[' from any shell¹ If you are using a different shell, just search for the description of its [ or test builtin in its documentation of if it doesn't have such a builtin², in the man page of the standalone test utility³ and you will find
Bash Script : what does #! bin bash mean? - Stack Overflow In bash script, what does #! bin bash at the 1st line mean ? In Linux system, we have shell which interprets our UNIX commands Now there are a number of shell in Unix system Among them, there is a shell called bash which is very very common Linux and it has a long history This is a by default shell in Linux When you write a script (collection of unix commands and so on) you have a option