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Bash / Shell

<command> & start and background
<command> && start and wait for success
> write to new file (file reset is first operation)
>> append to existing file
| pipe output

Terminal Shortcuts

CTRL

+a Go to beginning of commandline
+e Go to end of command line
+u Delete to line begin
+k Delete to line end
+c kill current process
+z put current process in background

Background processes

jobs list jobs
fg %# move to foreground
bg continue in background
kill %# or kill <pid> kill process
kill -9 .. terminate

Filtering

grep Find strings in files
sort Sort file
sort | uniq, sort -u Sort & remove duplicates
wc word count
awk don't ask
sed replace characters in file
jq, jq . filter json

Others

echo 'ABC=' | base64 -d decode base64
md5 <file>, sha256 <file> create checksum