Alx System Engineering (Devops)

Projects

0x00-shell_basics

Filename	Description	Command
0-current_working_directory prints the current path
1-listit	Prints the content of the curremt working directory	ls
2-bring_me_home	Send the user to home	cd ~
3-listfiles	Prints pwd files in long format	ls -l
4-listmorefiles	Lists files in the long format, including hidden ones	ls -a
5-listfilesdigitonly	Lists the files with group id displayed numerically	ls -an
6-firstdirectory	Creates a directory in the specified folder	mkdir
7-movethatfile	Moves betty like a gentleman	mv
8-firstdelete	Deletes a file from a location	rm
9-firstdirdeletion	Deletes a folder	rmdir
10-back	Goes to the previous directory	cd ..
11-lists	Gives files in root and /boot	ls -al
12-filetype	Checks the kind of file iamafile is	file
13-symbolic_link	Directs to another file at specified location	ln -s
14-copy_html	Copies html files using wildcards	*

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0x01-shell_permissions

Using shell executeables to perform commands

Filename	Command
0-iam_betty	su
100-change_owner_and_group	chown -R
101-symbolic_link_permissions	chown -h
102-if_only	chown
103-Star_Wars	telnet
10-mirror_permissions	chmod
11-directories_permissions	chmod -R
12-directory_permissions	chmod - R
13-change_group	chgrp
1-who_am_i	whoami
2-groups	groups
3-new_owner	chown
4-empty	touch
5-execute	chmod
6-multiple_permissions	chmod nnn
7-everybody	chmod ugo+x
8-James_Bond	chmod 007
9-John_Doe	chmod 753

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0x02-shell_redirections

Using shell commands to display and manipulate files

Related COmmands

• echo "Hello, World"
• find . -empty|rev|cut -d "/" -f 1|rev
• find . -type f -name "*.gif" -printf '%f\n' | rev | cut --complement -d . -f 1 | rev | LC_ALL=C sort -f
• echo $(cut -c 1 |tr -d '\n')
• tail -n +2 | cut -f 1 | sort | uniq -c | sort -nrk 1 | rev | cut -d " " -f 1 | rev | head -n 11
• find -mindepth 0 -type f -name "*.js" -delete
• find . -mindepth 1 -type d | wc -l
• ls -1t | head
• sort | uniq -u
• grep root /etc/passwd
• grep bin /etc/passwd | wc -l
• grep -A 3 root /etc/passwd
• grep -v bin /etc/passwd
• grep -i ^[[:alpha:]] /etc/ssh/sshd_config
• tr A Z|tr c e
• echo ""(Ôo)'"
• tr -d c|tr -d C
• rev
• cut -d ":" -f 1,6 /etc/passwd |sort -d
• cat /etc/passwd
• cat /etc/passwd /etc/hosts
• tail /etc/passwd
• head /etc/passwd
• cat iacta | head -3 | tail -1
• echo "Best School" > \*\\'"Best\ School"\'\\*$\?\*\*\*\*\*:)
• ls -la > ls_cwd_content
• tail -1 iacta>> iacta

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0x03-shell_variables_expansions

Using global and local variables

Related Commands

• alias ls="rm *"
• echo $(printf "%x" $DECIMAL)
• tr 'a-zA-Z' 'n-za-mN-ZA-N'
• paste -d, - - | cut -d, -f1
• echo $(printf %o $(($((5#$(echo $WATER | tr 'water' '01234'))) + $((5#$(echo $STIR | tr 'stir.' '01234'))))) | tr '01234567' 'bestchol')
• echo $((($BREATH)**($LOVE)))
• echo $((2#$BINARY))
• echo {a..z}{a..z}|tr " " "\n"|grep -v "oo"
• echo $(printf "%.2f" $NUM)
• echo hello $USER
• PATH="$PATH:/action"
• echo $PATH|tr ':' '\n'|wc -l
• printenv
• set
• BEST="School"
• export BEST="School"
• echo $((($TRUEKNOWLEDGE)+128))
• echo $((($POWER)/($DIVIDE)))