3、/etc/rc.d/rc3.d目录下分别有多个以K开头和以S开头的文件;分别读取每个文件,以K开头的输出为文件加stop,以S开头的输出为文件名加start,如K34filename stop S66filename start for files in /etc/rc.d/rc3.d/[KS]* ;do if [ `basename $files|cut -c1` == "K" ] ;then echo "$files stop...
In PowerShell length is the keyword to know the length of any string, so here we are checking if the length of a string is less than equals 5 or not(<=5). Once the length of string reached 6, loop exits. So the output id R, RR, RRR, RRRR, RRRRR. Here RRRRRR<=5, which mean...
Caution:Please be careful if you use this method. You should not include the keyword “in” in the for loop. If you leave the keyword “in” without any values, it will not use the positional parameter as shown below. It will not go inside the loop. i.e for loop will never get ex...
Once the shell script is executed, all the values in the range are listed, similar to what we had insimple loops. Bash For Loop with Ranges Example Additionally, we can include a value at the end of the range that is going to cause thefor loopto iterate through the values in incrementa...
Bash While Loop Another iteration statement offered by the shell programming language is the while statement. Syntax: while expression do commands done In the above while loop syntax: while, do, done are keywords Expression is any expression which returns a scalar value ...
This type of for loop is characterized by counting. The range is specified by a beginning (#1) and ending number (#5). The for loop executes a sequence of commands for each member in a list of items. A representative example in BASH is as follows to display welcome message 5 times wit...
# Program: # This program will show the use offor# History: #2015/1/12First release # 自定义列表forloopin12345doecho"loop=$loop"doneexit0deyuy/bin/my_shell >>chmodu+x for1.shdeyuy/bin/my_shell >> ./for1.shloop=1loop=2loop=3loop=4loop=5还可以通过读取文件内容生成变量列表deyuy...
breakexits from afor,select,while, oruntilloop in a shell script. Ifnumberis given,breakexits from the given number of enclosing loops. The default value ofnumberis1. Usage Notes This is a special built-in command of the shell. Exit Values ...
如果想要类似于执行shell脚本一样执行python脚本,例:./hello.py,那么就需要在 hello.py 文件的头部指定解释器,如下: #!/usr/bin/env python # env:显示当前用户的环境变量 print ("Hello,World!") 1. 2. 3. 如此一来,执行: ./hello.py即可。
Sincenohupusessystem callsand doesn’t go through the shell with its arguments, passing shell code directly to it presents a challenge and may result in an error. Since theforloop is a Bash script syntax, the program returns a syntax error if theforloop snippet is supplied unmodified. ...