echo "(string comparison)" 20 fi 21 22 # 在这个特定的例子中,"-ne"和"!="都可以. 23 24 exit 0 01 #!/bin/bash 02 # 测试字符串是否为null 03 # $string1 没被声明和初始化 04 if [ -n $string1 ] 05 then 06 echo "String \"string1\" is not null." 07 else 08 echo "String ...
Bash string comparison It is advisable always to check and compare if two strings are equal in a Bash script; this is quite important for different reasons. If two strings are equal in a Bash script, it implies that both strings have the same length and character sequence. The “if” stat...
/bin/bash # Script to do string equality comparison name=linuxtechi if [ $USER = $name ] then echo "User exists" else echo "User not found" fi # script to check string comparisons var1=a var2=z var3=Z if [ $var1 \> $var2 ] then echo "$var1 is greater" else echo "$var...
-n is one of the supported bash string comparison operators used for checking null strings in a bash script. When -n operator is used, it returns true for every case, but that’s if the string contains characters. On the other hand, if the string is empty, it won’t return true. -...
Bash字符串处理(与Java对照) - 10.判断两个字符串是否相等(不等) In Java String.equals & String.equalsIgnoreCase boolean equals(Object anObject) 比较此字符串与指定的对象。 boolean equalsIgnoreCase(String anotherString) 将此String 与另一个 String 进行比较,不考虑大小写。
BASH_LINENO BASH_SOURCE BASH_SUBSHELL BASH_VERSINFO BASH_VERSION 34.1.4 字符串操作 对字符串的操作,存在着大量的扩展集合。其中一些扩展尤其适用于对路径名的操作。扩展式 ${#parameter} 扩展为parameter内包含的字符串的长度。一般来说,参数parameter是个字符串。然而,如果参数parameter是“@”或“*”,那么扩展...
/bin/bash # longest-word3 : find longest string in a file for i; do if [[ -r $i ]]; then max_word= max_len= for j in $(strings $i); do len=${#j} if (( len > max_len )); then max_len=$len max_word=$j fi...
# bin/bash -x -e # Common shebang errorsecho$((n/180*100))# Unnecessary loss of precisionls *[:digit:].txt# Bad character class globssed's/foo/bar/'file > file# Redirecting to inputvar2=$var2# Variable assigned to itself[ x$var= xval ]# Antiquated x-comparisonsls() { ls -...
$ scl enable gcc-toolset-12 bash For more information, see GCC Toolset 12. Bugzilla:2110583 The updated GCC compiler is now available for RHEL 9.2 The system GCC compiler, version 11.3.1, has been updated to include numerous bug fixes and enhancements available in the upstream GC...
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