hacks.md

Bash hacks

Pipe std streams

command 2>&1 | another-command

Hacks

Install local CA for pip

1. Copy cert to /usr/local/share/ca-certificates/
2. sudo update-ca-certificates
3. Add these lines to ~/.config/pip/pip.conf \

[global]
cert=/etc/ssl/certs/ca-certificates.crt

Performance metrics with curl

Source: https://stackoverflow.com/a/22625150

curl-format.txt:

time_namelookup:  %{time_namelookup}s\n
time_connect:  %{time_connect}s\n
time_appconnect:  %{time_appconnect}s\n
time_pretransfer:  %{time_pretransfer}s\n
time_redirect:  %{time_redirect}s\n
time_starttransfer:  %{time_starttransfer}s\n
----------\n
time_total:  %{time_total}s\n

Command: curl -w "@curl-format.txt" -o /dev/null -s "http://wordpress.com/"

Fix missing newline EOF in Git repository

git ls-tree --full-tree -r --name-only HEAD | head -n 3 | tee /dev/tty | xargs -I{} sed -i -e '$a\' {}

From Stackoverflow: for f in $(git grep --cached -Il ''); do tail -c1 $f | read -r _ || echo >> $f; done

Download apt package and dependencies

Useful for installing a package on a computer without network. Borrowed from: https://stackoverflow.com/a/27469489

Download:

apt-get download $(apt-rdepends <package>|grep -v "^ " |grep -v "^libc-dev$")

Install:

sudo dpkg -i *.deb

Copy image to clipboard

xclip -selection clipboard -t image/png -i example.png

mandb trigger taking forever

1. Empty man-db cache: sudo mandb -t && sudo rm -rf /var/cache/man/ && sudo mandb -c
2. sudo dpkg -- configure -a