bash : unary operator expected
在运行时出现了[: =: unary operator expected 的错误，就一直找不到 ... shell 脚本的错误：代码如下： #!/usr/bin/env bash 2 #Filename 3.sh 3 4 if ..., You would need to add quotes around $1. if [ "$1" = "-r" ]; then echo "I am here" fi. When $1 is empty you are getting if [ = "-r"] which is a syntax ..., The first thing that the shell does when executing that particular line of code is substitute the value of $i , just like your favorite editor's search & replace function would. ... You also have the option of specifying a default value for $i if, Otherwise, when $1 is completely empty, your test becomes: [ != -v ]. instead of [ "" != -v ] ...and != is not a unary operator (that is, one capable of ..., If you know you're always going to use bash, it's much easier to always use the double bracket conditional compound command [[ ... ]] , instead ..., if [ = "and" ]; which is not a valid syntax. (It would also fail with a different error message if $aug1 included white space or shell metacharacters.) The modern [[ operator has lots of other nice features, including regular expression matchin,在寫shell script 如果遇到判斷式，例如 #!/bin/bash app-running=$(ps -ax | grep "[a]pp-server" | awk 'print $1}') if [ $app-running == "" ]; then , if [ = "and" ]; which is not a valid syntax. (It would also fail with a different error message if $aug1 included white space or shell metacharacters.) The modern [[ operator has lots of other nice features, including regular expression matchin,但是awk沒有抓到值的話，mask內就是null，當執行時就會出現[: ==: unary operator expected 這是因為$mask的值為「空」，變成==沒有左值而出現的錯誤，有兩種 ...
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 bash : unary operator expected 相關參考資料
shell脚本报错：[: =: unary operator expected_运维_viclee ...
在运行时出现了[: =: unary operator expected 的错误，就一直找不到 ... shell 脚本的错误：代码如下： #!/usr/bin/env bash 2 #Filename 3.sh 3 4 if ... https://blog.csdn.net -bash: [: =: unary operator expected. when no parameter given ...
You would need to add quotes around $1. if [ "$1" = "-r" ]; then echo "I am here" fi. When $1 is empty you are getting if [ = "-r"] which is a syntax ... https://stackoverflow.com Compare integer in bash, unary operator expected - Stack Overflow
The first thing that the shell does when executing that particular line of code is substitute the value of $i , just like your favorite editor's search & replace function would. ... You also ... https://stackoverflow.com Bash script error [: !=: unary operator expected - Stack Overflow
Otherwise, when $1 is completely empty, your test becomes: [ != -v ]. instead of [ "" != -v ] ...and != is not a unary operator (that is, one capable of ... https://stackoverflow.com shell - "unary operator expected" error in Bash if condition ...
If you know you're always going to use bash, it's much easier to always use the double bracket conditional compound command [[ ... ]] , instead ... https://stackoverflow.com "unary operator expected" error in Bash if condition - Stack ...
if [ = "and" ]; which is not a valid syntax. (It would also fail with a different error message if $aug1 included white space or shell metacharacters.) The modern [[ operator has lots of ot... https://stackoverflow.com Linux 的shell script 中，遇到unary operator expected 的解決方法
在寫shell script 如果遇到判斷式，例如 #!/bin/bash app-running=$(ps -ax | grep "[a]pp-server" | awk 'print $1}') if [ $app-running == "" ]; then https://medium.com "unary operator expected" error in Bash if condition - Stack Overflow
if [ = "and" ]; which is not a valid syntax. (It would also fail with a different error message if $aug1 included white space or shell metacharacters.) The modern [[ operator has lots of ot... https://stackoverflow.com unary operator expected的解決方法@ 血落閣:: 隨意窩Xuite日誌
但是awk沒有抓到值的話，mask內就是null，當執行時就會出現[: ==: unary operator expected 這是因為$mask的值為「空」，變成==沒有左值而出現的錯誤，有兩種 ... https://blog.xuite.net |