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why the "test.log" is empty?

The logs of shellscript seems to return on the terminal directly.

How can I record the returns of ssh-command ito a logfile in the script?

Not sh while.sh &> test.log

Thanks for your help ! ^_^

root@jump:~/sshtest# cat nodes
172.25.16.8
172.25.16.7
172.25.16.135
172.25.16.104
172.25.16.103

root@jump:~/sshtest# cat while.sh
#!/bin/bash

#set -x
exec &> test.log
nodes=nodes

while read node
do
        echo "---- $node ----"
        ssh $node hostname </dev/null
done < $nodes

root@jump:~/sshtest# sh while.sh
---- 172.25.16.8 ----
prometheus-vm2
---- 172.25.16.7 ----
prometheus-vm1
---- 172.25.16.135 ----
operator-vm6
---- 172.25.16.104 ----
operator-vm5
---- 172.25.16.103 ----
operator-vm4

root@jump:~/sshtest# ls -l test.log
-rw-r--r-- 1 root root 0 2021-08-09 14:55:49 test.log

root@jump:~/sshtest# uname -a
Linux jump 4.9.0-11-amd64 #1 SMP Debian 4.9.189-3+deb9u1 (2019-09-20) x86_64 GNU/Linux
Aragorn1026
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    Because you are executing it with `sh`, which runs `exec &` with output redirected. Probably better to use standard redirection operators, i.e. `exec >test.log 2>&1` – tripleee Aug 10 '21 at 05:57

0 Answers0