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Watch How Many Files There Are In A Folder

Sometimes you have a folder full of tens of thousands of files, a spool folder can quite often grow when something breaks. While you've waiting for a service to process these files you can watch the directory count every 20 seconds or so.

Command:
while :; do ls -al /usr/local/nagios/var/spool/perfdata/ | wc -l; sleep 20; done

Output:
14651
12519
12000
11565

Stelio Pappas showed me another way of doing this using the watch command:

Command:
watch "ls -al /usr/local/nagios/var/spool/perfdata/ | wc -l"

Output:

The screen will update every 2 seconds with the output of the command

With either command press CTRL + C to stop the watching.

Create A tar.gz File Of All Files In A Folder

Command:
tar -v -pczf /tmp/nagios_config_backup.tar.gz /usr/local/nagios/etc

Output:
tar: Removing leading `/' from member names
/usr/local/nagios/etc/
/usr/local/nagios/etc/cgi.cfg
/usr/local/nagios/etc/htpasswd.users
/usr/local/nagios/etc/nagios.cfg
/usr/local/nagios/etc/resource.cfg
/usr/local/nagios/etc/objects/
/usr/local/nagios/etc/objects/timeperiods.cfg
/usr/local/nagios/etc/objects/templates.cfg
/usr/local/nagios/etc/objects/printer.cfg
/usr/local/nagios/etc/objects/contacts.cfg
/usr/local/nagios/etc/objects/commands.cfg
/usr/local/nagios/etc/objects/localhost.cfg
/usr/local/nagios/etc/objects/windows.cfg
/usr/local/nagios/etc/objects/switch.cfg
/usr/local/nagios/etc/objects/box293_check_vmware.cfg

Unzip A .zip File Into A Folder

Command:
unzip -o /tmp/the_backup.zip -d /tmp/restored/

Output:
Archive:  /tmp/the_backup.zip
   creating: /tmp/restored/important_stuff/
  inflating: /tmp/restored/

important_stuff/crikey.php

inflating: /tmp/restored/

important_stuff/CHANGES.TXT

Find A File And List The Details

Command:
find /usr/local/nrdp/plugins -name check_icmp -exec ls -la {} \;

Output:
-rwxrwxr-x 1 nagios nagios 590901 Jun 24  2014 /usr/local/nrdp/plugins/AIX/powerpc/root/check_icmp
-rwxrwxr-x 1 nagios nagios 133548 Jun 24  2014 /usr/local/nrdp/plugins/SunOS/sparc/root/check_icmp
-rwxrwxr-x 1 nagios nagios 99064 Jun 24  2014 /usr/local/nrdp/plugins/SunOS/i386/root/check_icmp
-rwxrwxr-x 1 nagios nagios 97773 Jun 24  2014 /usr/local/nrdp/plugins/Linux/x86_64/check_icmp
-rwxrwxr-x 1 nagios nagios 80057 Jun 24  2014 /usr/local/nrdp/plugins/Linux/i386/check_icmp

Find All Files 0 Bytes In Size And Delete Them

Command:
find /tmp/ -maxdepth 1 -size 0 -exec rm -f "{}" \;

Find All Files LESS than 4000 Bytes In Size And Delete Them

Command:
find /tmp/ -maxdepth 1 -size -4000c -exec rm -f "{}" \;