integer expression expected bash if

Let's take a look at the simple technique for processing command line independent variables, and then look at the basic programming structure of bash. Receive independent variable In the sample program in the introductory article, we use the

[Shell] example of if, for, while flow statement and integer string comparison, shellwhile Preface: In fact, Shell is a command interpreter that explains the commands entered by the user and sends them to the kernel. In addition, Shell has its own

The condition test statement in bash-general Linux technology-Linux technology and application information. The following is a detailed description. [I = s] This post was last edited by yanyongkg at, 2011-8-13 Comparison string: ["string1" =

Integer comparison-Eq equals to, for example, if ["$ a"-eq "$ B"]-Ne is not equal to, for example, if ["$ a"-ne "$ B"]-Gt is greater than, for example, if ["$ a"-gt "$ B"]-Ge is greater than or equal to, for example, if ["$ a"-ge "$ B"]-Lt is less

Compile-language:The program needs a special compilation process before execution, which compiles the program into a machine language file, the runtime does not need to be re-translated, the results of the direct use of the compilation is OK. The

When it comes to programming, we are all not unfamiliar, but in Linux, we mainly do script writing. Of course, in order to understand the scripting of Linux, we have to first say the logical relationship of multi-command execution.1. Command

POSIX shell tips This article is used to record some of the useful tips I have found. This is a paper about POSIX (and other noncompliant shell script techniques. I have always insisted that the Bourne system is not a good programming language,

1, the use of rules Awk is suitable for text processing and report generation, and it has a number of well-designed features that allow you to program programs that require special skills.awk syntax is more common. It draws on some of the best

23. Grep/egrep Regular Expression exercises:1) display lines in the/etc/passwd file that do not end with bash;For:# grep-v "bash$"/etc/passwd2) Locate the two-bit or three-bit integer in the result of the ifconfig command execution;For:# Ifconfig |

Shell script variables are processed as strings rather than numbers by default, which makes it complicated to perform mathematical operations in shell scripts. Perl and python will be a better choice to maintain Script Programming specifications and