1.2for循环[root@centos7 ~]#helpforfor:forNAME[in WORDS ... ];doCOMMANDS;doneExecutecommandsforeachmemberinalist. Thefor' loop executes a sequence of commands for each member in a list of items. Ifin WORDS ...;' i
/bin/bash# This script iterates over a listofservices and # is used to determine whether they are running or not.if[-f myservices.txt];thenforservicein$(cat myservices.txt);dosystemctl status $service|grep--quiet"running"if[$?-eq0];then echo $service"is [ACTIVE]"elseecho $service"...
This chmod command allows other users to read and execute script. If you don’t want that, use the absolute mode 700 instead (and refer to 2.17 File Modes and Permissions for a refresher on permissions). 该chmod 命令允许其他用户读取和执行脚本。 如果不希望这样,请使用绝对模式 700(有关权限的...
开机启动文件 /etc/rc.local when system start , run this script ~/.bash_profile ~/.bashrc when user login, run this script mount to shared drive UI Color : make terminal more colorful, tell the diff between dir and file, the diff between execute and unexecute exportCLICOLOR=1exportLSCOLO...
B.批处理(Batch):用户事先写一个Shell脚本(Script),其中有很多条命令,让Shell一次把这些命令执行完,而不必一条一条地敲命令。 Shell脚本和编程语言很相似,也有变量和流程控制语句,但Shell脚本是解释执行的,不需要编译,Shell程序从脚本中一行一行读取并执行这些命令,相当于一个用户把脚本中的命令一行一行敲到Shell提...
for fork in "$@"; do set +e # we don't want prepare.sh, test.sh or hyperfine failing on 1 fork to exit the script early # Run prepare script (simplified) print_and_execute source "./prepare_$fork.sh" # Run the test suite (simplified) ...
这个被嵌套的循环(也称为内部循环,inner loop)会在外部循环的每次迭代中遍历一次它所有的值。注意,两个循环的 do 和 done 命令没有任何差别。bash shell 知道当第一个 done 命令执行时是指内部循环而非外部循环。 在混用循环命令时也一样,比如在 while 循环内部放置一个 for 循环。 $ cat test15 #!/bin/...
write small scripts like, copying a file from file.old that gets cleaned up in the process, i know i can just not delete the file but there are some times when i want to test the loop with file deletion but dont want to manually execute a shell scr...
Trapping the script exit#trap"echo Goodbye..."EXIT#count=1while[$count-le5]doecho"Loop #$...
Incorrect syntax when using a Bash Loop or a Bash Array Incorrect use of a compound command when defining a Bash Function Runtime ErrorA Runtime Error will be the next level of errors. The shell script runs with no syntax errors but fails to execute reliably certain tasks. The most common...