What does ! mean in the statement if [ ! -n "$1" ]
62690
Usage of -n and -z in test built in - Bash
4750
Show that for any positive integer n, $(3n)!/(3!)^n$ is an integer.
143719
How does !! work in bash?
140931
What is the difference between if(!!condition) and if(condition)
19260
What does the notation $q^k || n$ mean?
4772
Difference between "not equal" operators  and != in PHP
71607
What's this =! operator?
97684
Show $\frac{(2n)!}{n!\cdot 2^n}$ is an integer for $n$ greater than or equal to $0$
43370
What does "|=" mean? (pipe equal operator)
62172
Why does $-b < a < b \iff |a| < b$?
107154
History of notation: "!"
124765
How does bash interpret the equal operator with no surrounding spaces in a conditional?
103008
What does !$ mean?
145413
Floating point comparison `a != 0.7`
15469
Difference between ! vs !! vs * in /etc/shadow
61273
What do these ( += , -= , *= , /= ) Operators Mean?
118039
How prove $p!|(a+1)$ if $p!|a^p+1$