screen is one of my favorites. You can do so many things with it. It’s really handy when you want something to keep running after you disconnect from SSH. To disconnect a running screen press ctrl + a, ctrl + d. To see your screens screen -list. To restore one screen -r [somescreenname]

Ctrl+r i.e. reverse search is my favorite.

I love pushd and popd for treating your paths as an array. Good for backtracking and for scripting. Here’s an example:

$ mkdir -p my/test/folder
$ pushd my/test
~/my/test ~
$ pushd folder
~/my/test/folder ~/my/test ~
$ popd
~/my/test ~
$ pwd
/Users/brianhogan/my/test
$ popd
~
$ pwd
/Users/brianhogan

• rsync for moving stuff
• wget is great (especially with the -c (continue) flag)
• gnu parallel for running batch jobs in…parallel
• flock for making sure your cron job is only running one instance at any given time
• the $() for getting the output from a command that was mentioned earlier is great, and you can also
• I’m not sure where exactly it comes from, I think it ships with perl in deb-based distros, but the rename command is great for bulk-renaming jobs

Wrapping subcommands in $() is pretty brilliant for chaining things together.

For example, you can put together grep and awk to find a docker container via a docker-compose name to execute a script on. A silly example, but it works.

docker exec $(docker ps -aqf "name=$(docker-compose ps | awk '{print $1}'|grep "db")") bash "/run/a/script/import.sh"

Here is a simpler example that stops all docker containers:

docker stop $(docker ps -q)

rsync
I love rsync..
I rsync all over the place…backups…moving websites to another folder…you can even rsync to another server with ssh:

rsync -e -av --recursive --progress  --rsh='ssh -p3222 user@domain.com:folder/  ~/folder

Which :)

which name, for instance where is the dnf command on fedora..
which dnf gives /usr/bin/dnf

last 

It is pretty handy when you need to know if were a failure or to audit the system login, restart, or shutdown.

maybe not that much, but i love tail -f to see what’s happening live on some demon’s logs