I wanted to get the list of mounted partition by getting the sixth field of df using awk:
$ df|awk '{ print $6}' Mounted /dev /run / /dev/shm /run/lock /sys/fs/cgroup
With cumin the whole line is printed:
sudo cumin --trace --force 'name:1053 'df| awk "{ print $6}"'
----- OUTPUT of 'df| awk "{ print $6}"' -----
Filesystem 1K-blocks Used Available Use% Mounted on
udev 10240 0 10240 0% /dev
tmpfs 810132 82332 727800 11% /run
/dev/vda3 19479208 3585896 14880784 20% /
tmpfs 2025328 0 2025328 0% /dev/shm
tmpfs 5120 0 5120 0% /run/lock
tmpfs 2025328 0 2025328 0% /sys/fs/cgroup
/dev/mapper/vd-second--local--disk 21023324 834336 19098020 5% /srv
================And in the cumin log:
INFO cumin.cli.main] Cumin called by user 'hashar' with args:
Namespace(backend=None,
batch_size={'value': None,
'ratio': None},
batch_sleep=None,
commands=['df| awk "{ print $6}"'],
config='/etc/cumin/config.yaml',
debug=False,
dry_run=False,
force=True,
global_timeout=None,
hosts='name:docker-1053',
ignore_exit_codes=False,
interactive=False,
mode='sync',
output=None,
success_percentage=100,
timeout=None,
trace=True,
transport=None
)
INFO cumin.transports.clustershell.ClusterShellWorker.execute]
Executing commands [cumin.transports.Command('df| awk "{ print $6}"')]
on '1' hosts: integration-slave-docker-1053.integration.eqiad.wmflabsI am not sure what happens to $6, but it seems to be expanded by the shell. I guess because it executes literally: df | awk "{ print $6}", the variable being in double quote, it gets expanded to an empty string.
If switch double and single quotes with: sudo cumin --trace --force 'name:docker-1053' "df| awk '{ print $6}'", the variable is not passed at all. From the output:
100.0% (1/1) success ratio (>= 100.0% threshold) for command: 'df| awk '{ print }''.In cumin.log:
commands=["df| awk '{ print }'"]The not so straightforward way is to backslash the variable: 'df| awk "{ print \$6}"'.
That is with cumin 3.0.2-2