Arista Linux Essential (2)

Useful Utilities

• Date/time
• date +%Y%m%d-%H%M%S
• Epoch - Linux born time
• Sort
• du -s /var/* | sort -n
• -n: numeric order
• Cut
• cut -d: -f:1,6 /etc/password
• -c: cut columns
• Diff:
• Cli -p15 -c "show run" | diff -y -w -B --suppress-common-lines - /mnt/flash/startup-config
• -B --ingore-blank-lines
• -y --side-by-side
• -w --ignore-all-space
• regexp:
• greedy vs lazy, ? at the end of pattern
• grep = global reg exp print
• -i: ignore case
• -v: inverse, not-matching
• -A: print # lines AFTER matching
• -B: print # lines BEFORE matching
• sed = powerful stream editor
• remove quotes: sed -e 's/"//g'
• reverse ip address:
• echo "10.20.30.40" | sed -e 's/\([0-9]+\)\.\([0-9]+\)\.\([0-9]+\)\.\([0-9]+\)/\4.\3.\2.\1/'
• reverse A-record to fwd record
• awk
• awk -F: '{print $1, $6}
• alias shmc show int | awk '/^[A-Z]/ { intf=$1 } 
• tar
• tar czvf config.1.gz config.1

[admin@bn303 etc]$ Cli -p15 -c "show run" | diff -y -w -B --suppress-common-lines - /mnt/flash/startup-config

! Command: show running-config        | ! Startup-config last modified at  Wed Nov 28 17:01:44 2018 b

! device: bn303 (DCS-7512N, EOS-4.20.1F)       | ! device: bn303 (DCS-7512N, EOS-4.20.10M)