echo "---" echo "All the command-line parameters are: "$*"" if [ $# -lt "$MINPARAMS" ] then echo echo "This script needs at least $MINPARAMS command-line arguments!" fi echo exit 0 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. ...
# Note: The exit status may not be the same as with an if statement [[ $var == hello ]] && echo hi # Multi line (no else) [[ $var == hello ]] && { echo hi # ... } case设置变量的简单语句 在:内置的可以用来避免重复variable=在一个case语句。该$_变量存储的最后一个命令的最后...
From your scripts, you can run any program that you might normally run on the command line. For example, you can create a new directory from your script using themkdircommand. Begin with the same shebang line as before: #!/bin/bash Prompt the user for a directory name, using the echo...
LINE=1 while read CURRENT_LINE do echo "${LINE}: $CURRENT_LINE" ((LINE++)) done < /etc/passwd # This script loops through the file /etc/passwd line by line 注意⚠️continue 用于结束本次循环break 用于结束整个循环 参数传递 当我们运行脚本的时候,可以传递参数供脚本内部使用$ ./script.sh...
The first “echo” command is modified to use the “-n” option, which prevents the command from adding a trailing newline character. This means that the prompt for the user’s name will be printed on the same line as the “Please enter your name:” text. ...
aws_ssm_put_param.sh - reads a value from a command line argument or non-echo prompt and saves it to AWS Systems Manager Parameter Store. Useful for uploading a password without exposing it on your screen aws_secret*.sh - AWS Secrets Manager scripts: aws_secret_list.sh - returns the ...
The good news is that, echo lets you use the newline character\nto print a new line within the same output line if you use the-eoption: echo -e "Name\nAddress\nPhone Number" If you run the above command, you'll get this output: ...
#!/bin/bash echo "Do while loop example" a=1 while [ $a -le 5 ] do echo "Hi - Im number $a" (( a++ )) done echo "* End of Script *" Once you run the script, your output may look the same as the following. Example 07 – Access data from a file Usually, we use th...
echo "You selected Cancel." return 2 ;; * ) echo "Invalid input. Please enter y, n, or c." ;; esac done } Here's what the above script does: echo -n "Do you want to update the system? (y/n/c): "displays a prompt without a newline at the end. ...
echo主要用于回显,打印字符串。 SYNOPSIS echo [SHORT-OPTION]... [STRING]... echo LONG-OPTION -n do not output the trailing newline -e enable interpretation of backslash escapes -E disable interpretation of backslash escapes (default) 2转义字符 ...