# Bash tools ##### Awk First and third column from file, seperated by spaces `awk -F " " '{print $1,$3'} result.txt` Print from line 156 to line 170 `awk 'NR >= 156 && NR <= 170' log.txt` ##### Cat Copy Data to Other File `cat file1 > file2` Combine Files And Sort Alphabetically `cat file1 file2 | sort > file3` Create new file that consists of the contents of file1, followed by keyboard. `cat file1 -> file2` Multi line to singe line `cat multiline.txt | tr -d '\n' > oneline.txt` ##### Cut First and third column from file, seperated by spaces `cut -d' ' -f1,3 result.txt` ##### Find Search for a file `find location -name test.zip` `find / -name phppgadmin.conf` Search filetype `find / -i name "*.txt"` Accessed less than 3m ago `find / -amin -3` Accessed two days ago `find / -time -2` Smaller than 5MB, bigger than 2MB `find / -size -5M -and -size +2M` Remove all .DS\_Store files `find . -name '*.DS_Store' -type f -delete` Find files older than 7 days ``` find -type f -mtime +7 ``` **Mtime** *+n* More than *n*. *n* Exactly *n*. *-n* Less than *n*. ``` You can write -mtime 6 or -mtime -6 or -mtime +6: Using 6 without sign means "equal to 6 days old — so modified between 'now - 6 * 86400' and 'now - 7 * 86400'" (because fractional days are discarded). Using -6 means "less than 6 days old — so modified on or after 'now - 6 * 86400'". Using +6 means "more than 6 days old — so modified on or before 'now - 7 * 86400'" (where the 7 is a little unexpected, perhaps). ``` ##### Grep

Flag	Description
-i	Ignore Case
-l	Print name of each file which contains a match
-v	Return all lines which don't match the pattern
-c	Print a count of matching lines
-n	Print the line nr before each line that matches

List all files in directory where file name contains "test" `ls | grep "test"` `grep "" -l "test"` To search for a line containing text hello.gif in any .txt files `grep "hello\.gif" *.txt` Exactly and solely "apple" `grep -x "apple" list.txt` Everything else but not "apple" `grep -v "apple" fruitlist.txt` Match insensitive `grep -i "fruit" fruitlist.txt` Match apple and Apple `grep "[Aa]pple" fruitlist.txt` Grep Terminal History `history | grep "ionic"` Output non duplicates `grep -vFf file1 file2` ##### iPerf3 ``` # on receiver iperf3 -s -p 7575 # on client iperf3 -c -p 7575 ``` ##### Links Create symbolic link `ln -s /source /destination` Remove link `unlink /destination/script.sh` ##### Netcat Scan ports `nc -vvvnz -w5 185.31.92.195 5577 5500` ##### Netstat `sudo netstat -lntp`l - listening ports n - no hostnames t - tcp p - processes ##### SSH ssh-key to machines `ssh-copy-id ` ##### Tar Archive a directory / File `tar -zcvf archive.tar.gz test/` Unarchive ``` tar -zxvf archive.tar.gz tar -zxvf archive.tar.gz -C tar xopf thing.tar ``` TCP `tcpdump -n -v -i eth0 -s 0 port 80 -w /home/$USER/tcpdump.pcap`-n don't convert addresses to names -v verbose -i interface eth0 -s snapshot length ##### Users Remove user from group `passwd -d ` Reload bash user `. ~/.bash_profile` Display all users or groups `compgen -u` `compgen -g` Add user to sudoers `sudo usermod -aG sudo qrl` ##### Zip Compress a directory / File `zip -r ` Decompress `unzip -d ` ##### Wget Save website ``` wget --mirror --convert-links --adjust-extension --page-requisites --reject-regex "report" --no-warc-compression --warc-file="kalaralli" https://qrl.ee/kalaralli/ ```