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...
line done 使用while循环 while read -r line do echo $line done < filename While循环中read命令从标准输入中读取一行,并将内容保存到变量...line中。...在这里,-r选项保证读入的内容是原始的内容,意味着反斜杠转义的行为不会发生。输入重定向...
read text i=1 for word in $text do echo "Word No-$i = $word" ((i=$i+1)) done Then run the following script: $ bash forloop1.sh Example 2 - for Loop With a Break Statement The break statement is used within the ‘for loop’ to end the loop. First, create a file and ...
test.sh > filename:重定向 test.sh 的输出到文件 filename 中。如果 filename 存在的话,那么将会被覆盖。 test.sh &> filename:重定向 test.sh 的 stdout(标准输出)和 stderr(标准错误)到 filename 中。 test.sh >&2:重定向 test.sh 的 stdout 到 stderr 中。 test.sh >> filename:把 test.sh...
what a bash for loop is different ways to use bash for loop how to use a one-line bash for loop when DiskInternals can help you Are you ready? Let's read! What is a bash for loop? To begin with, loops are a must-have component of any programming language, since they allow us ...
forIin12345dostatements1 #Executedforall values of''I'', up to a disaster-conditionifany. statements2if(condition)thencontinue #Go to next iteration of Iinthe loop and skip statements3fistatements3done This script make backup of all file names specified on command line. If .bak file exists,...
For example, you can run UNIX command or task 5 times or read and process list of files using a for loop. A for loop can be used at a shell prompt or within a shell script itself. for loop syntax Numeric ranges for syntax is as follows: ...
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...
for i in {0..100}; do printf '%s\n' "$i" done 循环遍历可变数字范围 替代seq。 # Loop from 0-VAR. VAR=50 for ((i=0;i<=VAR;i++)); do printf '%s\n' "$i" done 循环数组 arr=(apples oranges tomatoes) # Just elements. ...
lines_loop() { # Usage: lines_loop "file" count=0 while IFS= read -r _; do ((count++)) done < "$1" printf '%s\n' "$count" } 1. 2. 3. 4. 5. 6. 7. 8. 用法示例: $ lines ~/.bashrc 48 $ lines_loop ~/.bashrc ...