Some useful linux/*nix cmds

Send cmd to screen (echo -ne '\015' emulates pressing the Enter key)

# screen -S sessionname -p 0 -X stuff 'command'`echo -ne '\015'`

Search file in packages (debian like distros)

# dpkg -S /etc/foo/foo.conf  

Check port availability

# nc -znvvw 3 192.168.1.100 80

Check availability of port range

# nc -znvvw 3 192.168.1.100 8080-8081

Row count in files with *.php extension

# find /root/* -type f -name "*.php" -exec wc -l {} + ;

Find files larger than 100MB

# find . -size +100M -exec du -h {} \;

SSH port forwarding example for SQL Server (remote-server - which have access to SQL Server by Local address 192.168.1.50, then we can connect to localhost:1433)

# ssh -f remote-server -L127.0.0.1:1433:192.168.1.50:1433 -N

FreeBSD

Get S.M.A.R.T for 3ware raided HDDs (disks starts from 0, 1, 2...)

# smartctl -a -d 3ware,0 /dev/twa0

Renew sendmail aliases

# cd /etc/mail
# make
# newaliases