The while loop is initiated with thewhile, succeeded by the condition enclosed withinthedoanddonekeywords. The script to printWelcome to Bash Scripting5 times using the while loop is as follows: #!/bin/bash i=1 while [ $i -le 5 ] do echo "Welcome to Bash Scripting" i=$(( $i+1 )...
You can have awhileloop to keep checking for that directory's existence and only write a message while the directory does not exist. If you want to do something more elaborate, you could create a script and show a more clear indication that the loop condition became true: #!/bin/bashwhi...
#!/bin/bash while true do if [ `date +%H` -ge 17 ]; then exit # exit script fi echo keep running ~/bin/process_data # do some work done 如果要退出循环而不是退出脚本,请使用 break 命令而不是 exit。 #!/bin/bash while true do if [ `date +%H` -ge 17 ]; then break # exit...
bash shell if-statement while-loop m3u 我正在编写一个脚本来解析m3u文件。目标是检索变量标记和url。我用这个文件做了测试。 #!/bin/bash echo "name,tvg-id,tvg-name,tvg-country,group-title,languages,url" while IFS= read -r line; do tags_detect="$(echo "$line" | grep -Eo '^#EXTINF:')...
do echo "We checked the current number is $number so we will increment once" ((number=number+1)) done echo "We have completed the while loop since $number is greater than 10." while循环的结果如下: [zexcon@fedora ~]$ ./learnToScript.sh ...
Loops are an important building block in a shell script which allows to iterate over a section of code. The bash loop constructs include the for loop, while loop, and until loop. 👉 Sometimes, you may find references to a select loop in bash. It is not part of the bash loop ...
while : do echo "endless loop" done 等价于 #!/bin/bash while true do echo "endless loop" done 可以在 if/then 中作占位符: #!/bin/bash condition=5 if [ $condition -gt 0 ] #gt表示greater than,也就是大于,同样有-lt(小于),-eq(等于) ...
while true; do 开始一个循环并一直重复。 echo -n "Enter the word: "; -n禁止在句末使用通常的换行符。 IFS=$'\n\t ' 显式设置内部字段分隔符。这意味着bash对单词的解释是,输入在换行符(\n)、制表符(\t)和空格('')上“分开”;一般来说,这是默认值,但是在per-script的基础上手动设置IFS或...
Using a "do while" loop in bash scripting is simple. Here, ‘-le’ keywords indicate the "less than or equal" sign of a normal programming language. The following script will run until the variable's value is greater than five. #!/bin/bash echo "Do while loop example" a=1 while [...
will run while the expression that we test for is true. 关键字"break" 用来跳出循环。而关键字”continue”用来不执行余下的部分而直接跳到下一个循环。 for-loop表达式查看一个字符串列表 (字符串用空格分隔) 然后将其赋给一个变量: for var in ...; do ......