Top UNIX Commands
cat – display or concatenate files
cd – change directory
chmod – change the permissions on a file or directory
compress – compress a file
cp – copy a file date – display the current date and time
diff – display differences between text files
echo – echo arguments to the standard output
file – determine the type of a file
find – find files of a specified name or type
finger – display information about a user
ftp – file transfer program
grep – searches files for a specified string or expression
kill – kill a process
lpr – print out a file
ls – list names of files in a directory
man – display an on-line manual page
mkdir – make a directory
more – scan through a text file page by page
mv – move or rename files or directories
nice – change the priority at which a job is being run
passwd – change your password
ps – list processes
pwd – display the name of your current directory
quota – disk quota and usage
rm – remove files or directories
rmdir – remove a directory
sort – sort and collate lines
talk – talk to another user
wc – display a count of lines, words and characters
cat – display or concatenate files
cat takes a copy of a file and sends it to the standard output (i.e. to be displayed on your terminal, unless redirected elsewhere), so it is generally used either to read files, or to string together copies of several files, writing the output to a new file.
cat ex displays the contents of the file
ex. cat ex1ex2 > newex
creates a new file newex containing copies of ex1 and ex2, with the contents of ex2 following the contents of ex1.
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