Ivan Pan ipan

The starting logical volume (vm) is 1TB. The volume group (data) has plenty of free space. This can be queried with lvdisplay.

The following command will extend the logical volume vm under volume group data by 4 TB

lvextend -L4T /dev/data/vm
resize2fs /dev/data/vm

Run vgdisplay to confirm:

nmap - port scanner

nmap <machine-address>

nmap -v <machine-address>

search and replace

sed -e 's:origin:github:' -i .orig .git/config

find all config

find . -name config -depth 1 -exec sed -e 's:origin:github:' -i .orig {} \;

disable apt repo

sudo sed -i 's:^deb:#deb:' /etc/apt/sources.list

remove unwanted repo:

sed -i '/^#/d' sources.list
sed -i '/^deb-src/d' sources.list
sed -i '/backports/d' sources.list

git rev-list

get latest commits for given directory

git rev-list -1 --abbrev-commit HEAD -- <dir-name>/

list all objects in git repo

git rev-list --objects --all

bash redirect

Error redirect to /dev/null

-# delete files in history
-git filter-branch --prune-empty \
-  --index-filter 'git rm -rf --cached \
-  --ignore-unmatch MY-BIG-DIRECTORY-OR-FILE' \
-  --tag-name-filter cat -- --all

	# www-data is non-login user
	sudo su -l www-data -s '/bin/bash'