如何在bash cli中将多个命令组合成单个？

Question

For deleting the volumes ,first it should be taken into offline then deleted. Below is the command to do it.

for i in {1..16}; do  vol --offline StressIO-v$i --force || break; done
for i in {1..16}; do  vol --delete StressIO-v$i || break; done

How to combine these commands and execute as single command?

Answer 1

You can do all 16 in parallel, halting on first error, with GNU Parallel like this:

parallel --halt now,fail=1 -k --dry-run 'vol --offline StressIO-v{} --force && vol --delete StressIO-v{}' ::: {1..16}

Sample Output

vol --offline StressIO-v1 --force && vol --delete StressIO-v1
vol --offline StressIO-v2 --force && vol --delete StressIO-v2
vol --offline StressIO-v3 --force && vol --delete StressIO-v3
vol --offline StressIO-v4 --force && vol --delete StressIO-v4
vol --offline StressIO-v5 --force && vol --delete StressIO-v5
vol --offline StressIO-v6 --force && vol --delete StressIO-v6
vol --offline StressIO-v7 --force && vol --delete StressIO-v7
vol --offline StressIO-v8 --force && vol --delete StressIO-v8
vol --offline StressIO-v9 --force && vol --delete StressIO-v9
vol --offline StressIO-v10 --force && vol --delete StressIO-v10
vol --offline StressIO-v11 --force && vol --delete StressIO-v11
vol --offline StressIO-v12 --force && vol --delete StressIO-v12
vol --offline StressIO-v13 --force && vol --delete StressIO-v13
vol --offline StressIO-v14 --force && vol --delete StressIO-v14
vol --offline StressIO-v15 --force && vol --delete StressIO-v15
vol --offline StressIO-v16 --force && vol --delete StressIO-v16

If you like how that looks, remove the --dry-run and run it again for real.

If you are not worried about stopping on fail or the order of execution, you can simplify that right down to:

parallel 'vol --offline StressIO-v{} --force && vol --delete StressIO-v{}' ::: {1..16}

Answer 2

You can check exit status of first offline comment and execute delete in single loop:

for i in {1..16}; do
    vol --offline StressIO-v$i --force && vol --delete StressIO-v$i || break
done

Answer 3

Put && in between these two commands. This will execute both the commands in a single go.

Otherwise create a script as vi example.sh

And paste the below lines in the script files as:

#!/bin/bash
for i in {1..16}; do  vol --offline StressIO-v$i --force || break; done
for i in {1..16}; do  vol --delete StressIO-v$i || break; done

Save this file by ESC+ wq!

Then make it executable

chmod +x example.sh

Run this script as :

./example.sh