echo "arg1 is out of range." exit 2 fi if (( $2 <= 20 ))#等同于 [ $2 -le 20 ] then echo "arg2 is out of range." fi CTRL+D /> sh ./test3.sh Usage: ./test3.sh arg1 arg2 /> echo $?#Shell脚本的退出值为exit的参数值。 1 /> sh ./test3.sh 40 30 arg1 is out ...
For loop with three parts can be defined with multiple initializations, termination conditions and actions. The following example shows the use of this type of loop. Here,$xand$yvariables are initialized by5and25. The loop will continue until the value of$xis less than or equal to20and the...
Since that command does not exist, it creates a specific kind of error which is indicated by the program’sexit status. The exit status of a program is an integer which indicates whether the program was executed successfully or if an error occurred. The exit status of the last program run ...
Create a bash file named loop8.bash with the following script to know the way to exit from the loop based on any particular condition. #!/bin/bash # Define a for loop to iterate 10 times for (( i=1; i<=10; i++ )) do # Define the conditions to terminate the loop if (( $...
bashtrap(){ echo "CTRL+C Detected !...executing bash trap !"}# for loop from 1/10 to 10/10for a in `seq 1 10`; do echo "$a/10 to Exit." sleep 1;doneecho "Exit Bash Trap Example!!!" 8. Arrays 8.1. Declare simple bash array...
bash 中的条件语句，基础就是 Test 。 if 先来个实例： x=5; if [ $x = 5 ]; then e...
最初，我使用的是for-loopbash中的变量
There is three loop constructs available in bash: for-loop, while-loop, and until-loop. All the bash loop constructs have a return status equals to the exit status of the last command executed in the loop, or zero if no command was executed. The For loop...
Thetestcommand checks if the value of thexvariable is equal to3; if this test returns true, the script encounters thebreakkeyword, and theforloop exits. #!/bin/bashmax=5printf"Print Numbers from 0 to$max\n"printf"Program will exit when we hit 3\n"for((x=0;x<=max;x++));doprintf...
shell Bash中的While-loop子壳困境问题在于while循环是管道的一部分。在bash管道中，管道的每个元素都在...