Among them, length gives you the length of a string. abhishek@handbook:~$ expr length "my string" 9 Since the expr command outputs the length, you should store it in a variable using command substitution. #!/bin/bash str="my string" length=$(expr length "$str") echo "Length of my...
A string is the sequence of the different char, which may include the spaces. In Bash, the length of the string is the total number of chars in that string.For example, the "Hello World" string contains ten char and one space. Therefore, its length is eleven....
the value of parameter is substituted. 使用expr substr取子串 另外也有用expr来取子串的,但效率不如上面。 expr substr "$STR" "$POS" "$LENGTH" 注意:POS从1开始。 man expr 写道 substr STRING POS LENGTH substring of STRING, POS counted from 1 [root@jfht ~]#STR=Hello [root@jfht ~]#expr...
test 命令有很多参数. -n 的意思是 “the length of STRING is nonzero”. -f 的意思是 “FILE exists and is a regular file”. 第二段代码,这个例子展示了如何门解析处理以等号分隔的参数(例如:–-option=argument 这样的传参方式),不使用getopt和getopts函数实现。 1 2 3 4 5 6 7 8 9 10 11 12...
But this doesn't mean that you don't have string manipulation functions. In the previous chapter, you learnedarithmetic operators in Bash. In this chapter, you will learn how to manipulate strings using a variety of string operations. You will learn how to get the length of a string, conca...
length_example.sh #!/bin/bash # Show the length of a variable. a='Hello World' echo ${#a} # 11 b=4953 echo ${#b} # 4 ./length_example.sh 11 4 五、if语句 if 中一定要用[]来描述里面的判断语句 注意这里的单个 号 -eq 数值上的比较(==),=类似于string中的compare ...
1. Identify String Length inside Bash Shell Script ${#string} The above format is used to get the length of the given bash variable. $catlen.sh#! /bin/bash var="Welcome to the geekstuff"echo${#var} $ ./len.sh24 To understand more about bash variables, read6 Practical Bash Global ...
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-nSTRINGThelength ofSTRINGisgreater than zero.-zSTRINGThelengh ofSTRINGiszero(ie itisempty).STRING1=STRING2STRING1isequaltoSTRING2STRING1!=STRING2STRING1isnotequaltoSTRING2INTEGER1-eqINTEGER2INTEGER1isnumericallyequaltoINTEGER2INTEGER1-gtINTEGER2INTEGER1isnumerically greater thanINTEGER2INTEGER1-ltINTEG...
substring="${my_string:7:5}" echo $substring 输出将会是World。 在这个例子中,start参数为7,表示从第7个字符开始提取子字符串,length参数为5,表示提取长度为5的子字符串。 如果要提取逗号后面的所有字符,可以使用以下命令: 代码语言:bash 复制 substring="${my_string:7}" echo $substring 输出将会是World...