Shell command unix

COMMAND DESCRIPTION
#passwd    Change user password
#pwd          Print current directory
#cd              Change directory
#ls               List of files in a directory
wildcards * matches any number of characters, ? matches a single character
#file           Print the type of file
#cat           Display the contents of a file
#pr               Display the contents of a file
#pg or page               Display the contents of a file one page at a time
#more      Display the contents of a file one page at a time
#clear      Clear the screen
#cp or copy           Copy a file
#chown      Change the owner of a file
#chgrp        Change the group of a file
#chmod      Change file modes, permissions
#rm                Remove a file from the system
#mv                Rename a file
#mkdir           Create a directory
#rmdir           Remove a directory
#grep             Pattern matching
#egrep           grep command for extended regular expressions
#find              Used to locate files and directories

#>>               Append to the end of a file

#>                 Redirect, create, or overwrite a file

#|                   Pipe, used to string commands together
#||                Logical OR—command1 || command2—execute command2 if command1 fails
#&                 Execute in background
#&&             Logical AND—command1 && command2—execute command2 if command1 succeeds
#date           Display the system date and time
#echo          Write strings to standard output
#sleep         Execution halts for the specified number of seconds
#wc             Count the number of words, lines, and characters in a file
#head         View the top of a file
#tail           View the end of a file
#diff           Compare two files

#sdiff         Compare two files side by side (requires 132-character display)
#spell         Spell checker
#lp, lpr, enq, qprt           Print a file
#lpstat           Status of system print queues
#enable         Enable, or start, a print queue
#disable        Disable, or stop, a print queue

#cal               Display a calendar
#who             Display information about users on the system
#w                  Extended who command
#whoami        Display $LOGNAME or $USER environment parameter
#who am I           Display login name, terminal, login date/time, and where logged in
#f, finger Information about logged-in users including the users .plan and .project
#talk                Two users have a split screen conversation
#write            Display a message on a user’s screen
#wall             Display a message on all logged-in users’ screens
#rwall            Display a message to all users on a remote host
#rsh or remsh          Execute a command, or log in, on a remote host
#df                              Filesystems statistics

#ps                         Information on currently running processes
#netstat              Show network status
#vmstat              Show virtual memory status
#iostat          Show input/output status
#uname         Name of the current operating system, as well as machine information
#sar                 System activity report
#basename          Base filename of a string parameter

#man                   Display the on-line reference manual
#su                      Switch to another user, also known as super-user
#cut                    Write out selected characters
#awk                 Programming language to parse characters
#sed                  Programming language for character substitution
#vi                     Start the vi editor
#emacs             Start the emacs editor

Sample from seshu

Take from field for fix length file.

#cut -c 40-50 File.dat > xx28cv24.txt

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