bash 如何计算和检查传递的参数？
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时间：2020-09-18 00:07:17 来源:igfitidea点击:
How to count and check passed arguments?
提问by emurad
How can I translate the following Ruby code to Bash?
如何将以下 Ruby 代码转换为 Bash？
if ARGV.length == 0
abort "\nError: The project name is required. Aborting...\n\n"
elsif ARGV.length > 2
abort "\nError: The program takes two arguments maximum. Aborting...\n\n"
end
采纳答案by Seth Robertson
#!/bin/bash
USAGE="#!/bin/bash
if [ $# -eq 0 ]; then
echo -e "\nError: The project name is required. Aborting...\n\n"
exit 1
elif [ $# -gt 2 ]; then
echo -e "\nError: The program takes two arguments maximum. Aborting...\n\n"
exit 1
fi
: <project name> [subproject attribute]"
if [ $# -lt 1 ]; then echo -e "Error: The project name is required.\n$USAGE" >&2; exit 1; fi
if [ $# -gt 2 ]; then echo -e "Error: Two arguments maximum.\n$USAGE" >&2; exit 1; fi
回答by MGwynne
The following should be what you need:
以下应该是您所需要的：
#!/bin/bash
function functionName {
if [ $# = 0 ]
then echo "\nError: The project name is required. Aborting...\n\n"; exit 1
fi
if [ $# \> 2 ]
then echo "\nError: The program takes two arguments maximum. Aborting...\n\n"; exit 1
fi
}
functionName a
The TLDP bash guide is very good if you are looking to learn bash, see TDLP Bash guide.
如果您想学习 bash，TLDP bash 指南非常好，请参阅TDLP Bash 指南。
回答by Cosmin Cosmin
Maybe:
也许：
##代码##