How to get the total size of a folder using Linux scripting.
┌──[jason@192.168.1.2]─[~/Documents] └──╼ ╼ $ du -ack -BM | sort -nr | head -n 1 | awk '{print $1}' 30255M |
This shows the total size of a folder in megabytes easily. This would be very useful to have in a script to do something with the returned value.
Print the last used command in the bash shell.
┌──[jason@192.168.1.2]─[~/Documents] └──╼ ╼ $ echo !! echo finger -lmps $LOGNAME | sed -e "s/On/Logged in/g" | grep "since" |
Return just the IP address of an interface with the command line.
┌──[jason@192.168.1.2]─[~/Documents] └──╼ ╼ $ ip a | awk '/inet / { print $2 }' | sed -n 2p | cut -d "/" -f1 192.168.1.2 |
And this is how to get just your Internet-facing IP address with a simple command.
┌──[jason@192.168.1.2]─[~/Documents] └──╼ ╼ $ dig @ns1-1.akamaitech.net ANY whoami.akamai.net +short 203.192.407.302 |
Return just the Interface name with this one-liner.
┌──[jason@192.168.1.2]─[~/Documents] └──╼ ╼ $ ip a | awk '/: / { print $2 }' | sed -n 2p | cut -d ":" -f1 enp3s0 |
These commands should be very useful when placed in a script. Especially getting the interface name of the current network interface and the IP address. That could be very useful to someone.
These commands may be used to create a variable as well.
┌──[jason@192.168.1.2]─[~/Documents] └──╼ ╼ $ IFACE=$(ip a | awk '/: / { print $2 }' | sed -n 2p | cut -d ":" -f1) |
This will create a variable $IFACE containing the name of the current network interface.
Now that the interface name is in a variable, it may then be used in a script or simple command.
┌──[jason@192.168.1.2]─[~/Documents] └──╼ ╼ $ sudo ethtool $IFACE [sudo] password for jason: Settings for enp3s0: Supported ports: [ TP MII ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Supported FEC modes: Not reported Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Advertised FEC modes: Not reported Speed: 10Mb/s Duplex: Half Port: MII PHYAD: 32 Transceiver: internal Auto-negotiation: on Supports Wake-on: pumbg Wake-on: d Current message level: 0x00000007 (7) drv probe link Link detected: no |