21 нояб. 2017 г. · It is a conditional expression that evaluates whether file descriptor 1 (the shell's standard output) is connected to a terminal.

28 сент. 2012 г. · The if statement in shell uses the command [. Since [ is a command (you could also use 'test'), it requires a space before writing the condition to test.

20 апр. 2016 г. · So, By using the "if" statement we are verify the number of arguments are greater than or equal to one. As it's currently written, your answer ...

25 апр. 2014 г. · I want to write a script that take 1 command line argument( a directory) and then prompt for 2 number, it will then print out any file(each in a different line)

20 окт. 2014 г. · This if condition returns true if I'm connected to the internet. I want it to happen the other way around but putting ! anywhere doesn't seem to work.

26 авг. 2014 г. · If you go for the basic POSIX shell (/bin/sh) syntax, then the basic form of if is calling a program and evaluating its return code. There is a ...

12 авг. 2013 г. · It looks as if you were on the right track. You just need to add the else statement after the ";" following the "then" statement.

15 окт. 2014 г. · The thing following the if keyword is a command. The command is executed, and the condition is true if the command succeeds (exits with a ...

16 нояб. 2012 г. · I'm trying to create a simple Bash script to check if the website is down and for some reason the "and" operator doesn't work.

28 окт. 2013 г. · If $VARIABLE is a string, then [ -n $VARIABLE ] is true if the length of $VARIABLE is non-zero. Also, [ -n $VARIABLE ] is equivalent with: [ $VARIABLE ] ,