linux常用命令2
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2022-08-03
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Unix/Linux Command Reference
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File Commands
ls – directory listing
ls -al – formatted listing with hidden les
cd dir – change directory to dir
cd – change to home
cd - – change back to previous directory
pwd – show current directory
mkdir dir – create a directory dir
rm file – delete le
rm -r dir – delete directory dir
rm -f file – force remove le
rm -rf dir – force remove directory dir *
cp file1 file2 – copy le1 to le2
cp -r dir1 dir2 – copy dir1 to dir2; create dir2 if it
doesn't exist
mv file1 file2 – rename or move le1 to le2
if le2 is an existing directory, moves le1 into
directory le2
ln -s file link – create symbolic link link to le
touch file – create or update le
cat > file – places standard input into le
more file – output the contents of le
head file – output the rst 10 lines of le
tail file – output the last 10 lines of le
tail -f file – output the contents of le as it
grows, starting with the last 10 lines
Process Management
ps – display your currently active processes
top – display all running processes
kill pid – kill process id pid
killall proc – kill all processes named proc *
jobs – lists stopped or background jobs
bg – resume a stopped job in the background
fg – brings the most recent job to foreground
fg n – brings job n to the foreground
File Permissions
chmod octal file – change the permissions of le
to octal, which can be found separately for user,
group, and world by adding:
● 4 – read (r)
● 2 – write (w)
● 1 – execute (x)
Examples:
chmod 777 – read, write, execute for all
chmod 755 – rwx for owner, rx for group and world
For more options, see man chmod.
SSH
ssh [-p port] user@host – connect to host as user,
optionally on custom port port
scp [-P port] user@host:path1 path2 – copy the
remote le at path1 to local location path2
ssh-copy-id user@host – add your key to host for
user to enable a keyed or passwordless login
Searching
grep pattern files – search for pattern in les
grep -r pattern dir – search for pattern in dir
command | grep pattern – search for pattern in the
output of command
locate file – nd all instances of le
System Info
date – show the current date and time
cal – show this month's calendar
uptime – show current uptime
w – display who is online
whoami – who you are logged in as
finger user – display information about user
uname -a – show kernel information
cat /proc/cpuinfo – cpu information
cat /proc/meminfo – memory information
man command – show the manual for command
df – show disk usage
du – show directory space usage
free – show memory and swap usage
whereis app – show possible locations of app
which app – show which app will be run by default
type app – show which app or builtin will be run
Compression
tar cf file.tar files – create a tar named
le.tar containing les
tar xf file.tar – extract the les from le.tar
tar czf file.tar.gz files – create a tar with
Gzip compression
tar xzf file.tar.gz – extract a tar using Gzip
tar cjf file.tar.bz2 – create a tar with Bzip2
compression
tar xjf file.tar.bz2 – extract a tar using Bzip2
gzip file – compresses le and renames it to
le.gz
gzip -d file.gz – expands le.gz back to le
Network
ping host – ping host and output results
whois domain – get whois information for domain
dig domain – get DNS information for domain
dig -x host – reverse lookup host
wget file – download le
wget -c file – continue a stopped download
Installation
Install from source:
./configure
make
make install
dpkg -i pkg.deb – install a package (Debian)
rpm -Uvh pkg.rpm – install a package (RPM)
Shortcuts
Ctrl+C – halts the current command
Ctrl+Z – stops the current command, resume with
fg in the foreground or bg in the background
Ctrl+D – log out of current session, similar to exit
Ctrl+W – erases one word in the current line
Ctrl+U – erases the whole line
Ctrl+R – type to bring up a recent command
!! - repeats the last command
exit – log out of current session
* use with extreme caution.
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