Reading File Line by Line with Bash while Loop To read a file line by line in Bash scripting the while loop can be used. Let’s take the filename as input from the user and print it through a Bash script. #!/bin/bash set -e line_number=1 echo "Enter the File Name" read filen...
One-line While loop example: The code above will instruct your system to run command1, command2, command3, and command4 continually until the condition turns to “True.” Example 1: Infinite While loop in a shell script An infinite While loop means your script will run the loop commands n...
/bin/bashFILE=$1#read$FILEusing thefiledescriptorsexec3<&0exec0<$FILEwhilereadlinedo# use$linevariable to process lineecho$linedoneexec0<&3 You can easily evaluate the options passed on the command line for a script using while loop: ... .. while getopts ae:f:hd:s:qx: option do case...
在Bash脚本,有3种类型loops:for loop,while loop, 和until loop. 这三个用于迭代值列表并执行一组给定的命令。 Bash For 循环语法 for loop遍历一系列值并执行一组命令。 For loop采用以下语法: forvariable_name in value1 value2 value3..ndocommand1 command2 commandn done 1. 2. 3. 4. 5. 6. Ba...
while read line do # use $line variable to process line echo $line done exec 0<&3 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. You can easily evaluate the options passed on the command line for a script using while loop:
while true do echo "endless loop" done 可以在 if/then 中作占位符: #!/bin/bash condition=5 if [ $condition -gt 0 ] #gt表示greater than,也就是大于,同样有-lt(小于),-eq(等于) then : # 什么都不做,退出分支 else echo "$condition" ...
Hopefully, these examples have demonstrated the power of aloop at the Bash command line. You really can save a lot of time and perform tasks in a less error-prone way with loops. Just be careful. Your loops will do what you ask them to, even if you ask them to do something destructi...
Bash For Infinite Loop In one Line # for (( ; ; )); do echo "Hello World!"; done # while true; do echo "Hello World!"; done # while :; do echo "Hello World!"; done Bash For Loop In One Line with Files # for i in *; do echo "Found the following file: $i"; done ...
while IFS= read -r _; do ((count++)) done < "$1" printf '%s\n' "$count" } 用法示例: $ lines ~/.bashrc 48 $ lines_loop ~/.bashrc 48 计算目录中的文件或目录 这是通过将glob的输出传递给函数然后计算参数的数量来实现的。 示例功能: ...
Bash For Loop In One Line with Files 代码语言:txt AI代码解释 # for i in *; do echo "Found the following file: $i"; done # for i in `cat filelist.txt`; do echo ${i}; done; if a line may include spaces better use a while loop: ...