Use GNU parallel

Use GNU parallel
Create cron tasks in batches:

1. # Host. lst is the host list
   
   
   # View the current cron task
   Parallel -- nonall-j0 -- slf host. lst "hostname; crontab-l"
   
   
   # View/var/spool/cron files
   Parallel -- nonall-j0 -- slf host. lst "hostname; ls-l/var/spool/cron"
   
   
   # Set a cron task
   Parallel -- nonall-j0 -- slf host. lst echo '"0 0 **** cd/root/nmon;/root/nmon-f-s600-c144">/var/spool/cron/root'
   

-- The tag parameter adds a tag for the output row

1. # When there is an input parameter, the marked content is an input parameter,
2. # When no parameter is input (-- nonall), the content is marked as sshlogin.
3. Parallel -- tag -- nonall-j0 -- slf host. lst uptime

Scp file collection

1. Parallel-a host. lst scp '"{}:/root/nmon/* 160401 *. nmon "'.

# Host. lst is the host list


# View the current cron task
Parallel -- nonall-j0 -- slf host. lst "hostname; crontab-l"


# View/var/spool/cron files
Parallel -- nonall-j0 -- slf host. lst "hostname; ls-l/var/spool/cron"


# Set a cron task
Parallel -- nonall-j0 -- slf host. lst echo '"0 0 **** cd/root/nmon;/root/nmon-f-s600-c144">/var/spool/cron/root'

# -- Tag can add a tag for the output row.
# When there is an input parameter, the marked content is an input parameter,
# When no parameter is input (-- nonall), the content is marked as sshlogin.
Parallel -- tag -- nonall-j0 -- slf host. lst uptime