File permission in unix is done with the help of chmod command.
chmod command in unix
chmod octal file – change the permissions of file
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.
For Basic commands tutorial. Please refer to Basic commands in unix
For Process Management tutorial. Please refer to Process Management commands in unix
Here are the list of Process Management commands in unix.
ps command in unix
ps – display your currently active processes
top command in unix
top – display all running processes
kill command in unix
kill pid – kill process id pid
killall proc – kill all processes named proc *
bg command in unix
bg – lists stopped or background jobs; resume a stopped job in the background
fg command in unix
fg – brings the most recent job to foreground
fg n – brings job n to the foreground
we can have and idea about basic commands from the other posts.
Here are the list of file commands in unix. These are the basic commands of unix.
ls – directory listing
ls -al – formatted listing with hidden files
cd dir – change directory to dir
cd – change to home
pwd – show current directory
mkdir dir – create a directory dir
rm command in unix
rm file – delete file
rm -r dir – delete directory dir
rm -f file – force remove file
rm -rf dir – force remove directory dir *
cp file1 file2 – copy file1 to file2
cp -r dir1 dir2 – copy dir1 to dir2; create dir2 if it
doesn’t exist
mv command in unix
mv file1 file2 – rename or move file1 to file2
if file2 is an existing directory, moves file1 into
directory file2
ln -s file link – create symbolic link link to file
touch file – create or update file
cat > file – places standard input into file
more file – output the contents of file
Head command in unix
head file – output the first 10 lines of file
Tail command in unix
tail file – output the last 10 lines of file
tail -f file – output the contents of file as it
grows, starting with the last 10 lines
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