Shell introduces the basic syntax --- shell

 

1. shell scripting language efficiently run on linux systems
2. Mainly used to develop some practical, automated gadgets, rather than to the development of large-scale software with complex business logic
3. Basic shell commands Basic commands are also linux operating system, as follows:

　　　　

command	effect	example
cd	Change directory	cd /
ls	List directory contents	ls -al
cat	View the contents of small files	cat xxx
chmod	Modify the file or directory permissions	chmod 777 xxx -R
chown	The owner to change the file or directory or their group	chown mysql:mysql test.txt
cp	Copy files	cp xxx yyy
diff	Compare file difference	diff xxx yyy
find	Query File	find / -name xxx
mv	Move or rename the existing file or directory	mv xxx yyy
rm	To delete a file or directory	rm xxx -rf
touch	Create an empty file	touch xxx
which	Finding qualified file in $ PATH environment variable settings directory	which find
ssh	Secure remote login	ssh ip
grep	Finding qualified file string	One of the Three Musketeers
wc	Statistical row	wc -l xxx
date	Host query the current time	date +"%Y-%m-%d %H-%M-%S"
exit	Exit command	exit
kill	Kill process	kill -9 pid
id	View user	id xxx
ps	Query process case	ps
sleep	Sleep time (sec)	sleep 5
uname	Host information queries	uname -a
passwd	Change password	passwd user
ping	Check whether the network through	ping ip
df	Check disk space usage	df -h
echo	Standard output command	echo xxx
pwd	Directory inquiries	pwd
head	N front row view files	head -10 xxx
tail	N rows behind view files	tail -10 xxx
mkdir	Create a directory	mkdir xxx
seq	Generating the number of all integers from one to another between a number of	seq 1 10