Shell script programming introductory tutorial: 10 recommended zero-based introductory tutorials on shell script programming

if statement format if condition then Commanddelse Commandfi Don’t forget the end If statement forgets the end fitest.sh: line 14: syntax error: unexpected end of fi The three conditional expressions of if ifcommandthen if function then command execution is successful, It is equal to returning 0 (such as grep, a match is found). The execution fails and returns non-0 (grep, no match is found) if [ expression_r_r_r ]then If the expression result is true, then 0 is returned. If leads the 0 value to thenif test expression_r_r_rthen expression

1. How to use the if statement in Linux shell script programming (conditional judgment)

Introduction: This article mainly introduces the use of if statements in Linux shell script programming. Please refer to it

2. Detailed introduction to Linux shell scripts Basic Learning (7)

Introduction: Basic Learning of Linux Shell Script If you only look at the previous part, Although there are some examples in the theoretical part, they are not systematic enough. Here we will show you Linux shell script programming with specific examples to help you improve your learning and improvement of the basics of Linux shell.

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