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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
diff show differences

Headline

tar -tvf List with details
tar czf data.tar.gz <folder/files> compress file
tar -cjf archive.tar.bz2 <folder/files> compress with bzip2
tar -xzf data.tar.gz decompress file
tar -rvf archive.tar newfile append to file

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
md5sum <file>, sha256sum <file> create checksum
visidata search tabular/log files

Visidata

<source> Control-h Open the help menu Control-c Abort the current command Control-q Force-quit VisiData entirely q Quit the current VisiData “sheet” gq Quit all VisiData sheets and exit gracefully Shift-U Undo Shift-R Redo </source>

<source> / + regex Search forward in current column ? + regex Search backward in current column g/ + regex Search forward in all columns g? + regex Search backward in all columns </source>

Log analysis

<source bash> sudo awk '{print $1" "$2" "$3, $4, $5, substr($0, index($0,$6))}' /var/log/auth.log | jq -R -c 'split(" ") | {timestamp: (.[0]+" "+.[1]+" "+.[2]), hostname: .[3], process: .[4], message: .[5:] | join(" ")}' > auth.json </source>