Differences between while and for in shell programming

1. Code

Echo-en cat abc.txt | ssh-oConnectTimeout =@</dev/} & echo-en echo-e echo-en line in 'cat abc.txt | sed-e user = 'echo | awk-F ip = 'echo | awk-F ssh-oConnectTimeout =} & echo-en; date root. root .abc.txt

 

2. Run

3. Summary

From the code, we can see that,

When there are ssh and scp in the loop body, add </dev/null)

, That is, when it encounters a space, it starts to execute the loop body. Therefore, if you need to read data in rows, You need to convert the space into other characters.

The execution result shows that,