After searching the web for some time, I can't seem to find a documentation of the following Bash option.
-n, in the context of if [ -n $variable ]
To my knowledge, this option test if a certain variable is set, but I want to read it in a reference manual.
I've come across the following option on the man pages of Bash
--norc
but, I'm pretty sure -n is not the abbrevation for --norc.
Can someone pinpoint a documentation reference manual of Bash that explains the function of -n.
答案 0 :(得分：3)
man bash Everything you ever needed to know about bash is in the man page.
-n string
True if the length of string is non-zero.
To search man pages when you open them use /. I did this /-n . Note the space is important or you find the -norc items etc.