linux shell check arguments
2020年5月5日 — The above script will exit if the number of argument is not equal to 2. $ bash arguments.sh 1 You must enter exactly 2 arguments $ bash ... ,2018年8月14日 — Well,. if [ "$1" == "" ] || [ $# -gt 1 ]; then echo "Parameter 1 is empty". First, use = instead of == . The former is standard, the latter a bashism ... ,2013年11月14日 — The $# variable will tell you the number of input arguments the script was passed. The -z switch will test if the expansion of "$1" is a null string or not. If it is a null string then the body is executed. You normally need to ex,It looks like you're doing option handling in a shell script. Here's the idiom for that: #! /bin/sh - # idiomatic parameter and option handling in sh while test $# -gt 0 ... ,2013年12月15日 — Just like any other simple command, [ ... ] or test requires spaces between its arguments. if [ "$#" -ne 1 ]; then echo "Illegal number of ... ,2016年10月6日 — If somebody tries to invoke the script without passing in the correct number of arguments, and checking to make sure the command line ... ,#!/bin/bash # usage-message.sh : $1?"Usage: $0 ARGUMENT"} # Script exits here if command-line parameter absent, #+ with following error message. ,2015年2月1日 — Use $# which is equal to the number of arguments supplied, e.g.: if [ "$#" -ne 1 ] then echo "Usage: ..." exit 1 fi. Word of caution: Note that inside ... ,2013年2月8日 — What about the shorter : #!/bin/bash [[ $1 == A ]] && echo "A" || echo "not A" ? And a beginner version (identical logic) : #!/bin/bash if [[ $1 == A ]]; ...
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 linux shell check arguments 相關參考資料
Bash script - How to check number of supplied command-line ...
2020年5月5日 — The above script will exit if the number of argument is not equal to 2. $ bash arguments.sh 1 You must enter exactly 2 arguments $ bash ... https://linuxconfig.org check command line arguments - Unix & Linux Stack Exchange
2018年8月14日 — Well,. if [ "$1" == "" ] || [ $# -gt 1 ]; then echo "Parameter 1 is empty". First, use = instead of == . The former is standard, the latter a bashism .... https://unix.stackexchange.com Check existence of input argument in a Bash shell script ...
2013年11月14日 — The $# variable will tell you the number of input arguments the script was passed. The -z switch will test if the expansion of "$1" is a null string or not. If it is a null st... https://stackoverflow.com Check if any of the parameters to a bash script match a string ...
It looks like you're doing option handling in a shell script. Here's the idiom for that: #! /bin/sh - # idiomatic parameter and option handling in sh while test $# -gt 0 ... https://superuser.com Check number of arguments passed to a Bash script - Stack ...
2013年12月15日 — Just like any other simple command, [ ... ] or test requires spaces between its arguments. if [ "$#" -ne 1 ]; then echo "Illegal number of ... https://stackoverflow.com Checking for the correct number of arguments - Stack Overflow
2016年10月6日 — If somebody tries to invoke the script without passing in the correct number of arguments, and checking to make sure the command line ... https://stackoverflow.com How to check if there are no parameters provided to a ...
#!/bin/bash # usage-message.sh : $1?"Usage: $0 ARGUMENT"} # Script exits here if command-line parameter absent, #+ with following error message. https://unix.stackexchange.com How to check that a parameter was supplied to a bash script ...
2015年2月1日 — Use $# which is equal to the number of arguments supplied, e.g.: if [ "$#" -ne 1 ] then echo "Usage: ..." exit 1 fi. Word of caution: Note that inside ... https://stackoverflow.com use conditional in bash script to check string argument - Stack ...
2013年2月8日 — What about the shorter : #!/bin/bash [[ $1 == A ]] && echo "A" || echo "not A" ? And a beginner version (identical logic) : #!/bin/bash if [[ $1 == A ]]; ... https://stackoverflow.com |