Required Linux Commands

Syntax                             Example                      Description

man {command}                      man ls                       manual for the command
man -k {word}                      man -k list                  commands related to that word.
ls {path}                          ls                           lists files in current directory
ls -l {path}                       ls -l                        long listing of files in current directory
ls -a {path}                       ls -a                        listing includes . files
cd {dirname}                       cd 274/projects              changes working directory 
cd ~                               cd ~                         go to home directory
cd ..                              cd ..                        go up one level
mkdir {dirname}                    mkdir projects               creates a new directory
rmdir {dirname}                    rmdir projects               removes an empty directory
rm -r {dirname}                    rmdir -r projects            removes all files and subdirectories
pwd                                pwd                          displays working directory
cp {file1} {file2}                 cp t.java 274/t.java         copies a file
cat {file}                         cat t.java                   lists a file on the terminal
cat {newfile} >> {oldfile}         cat t1.java >> t.java        appends newfile to the end of oldfile
mv {oldfile} {newname}             mv t.java 274/t.java         moves oldfile to newname
more filename                      more t.java                  view file one screen at a time
pico {filename}                    pico t.java                  edit t.java
*                                  ls t*                        * matches any string of characters
{command} > {file}                 java test > out              directs the output of the command to the file
{command} | {command}              ls | more                    Pipes the first command output to second's input
telnet {ip address}                telnet heart.cecs.csulb.edu  connect to CECS computer
ssh linux                          ssh linux                    connect to linux from heart
chmod 644 {filespec}               chmod 644 t.java             read, write for you-- read for group and anyone
chmod 755 {filespec}               chmod 755 MyShare            read, write, execute for you -- read, execute for rest

Pico commands

Control O                                                       write text to a file
Control X                                                       exit
Control K                                                       delete the line the cursor is on

Permissions

Ten binary digits in four groups _ ___ ___ ___
The first digit is one for a directory and 0 for a file.
The next three groups of three digits each are for you, your group, and anyone.
In each group the first digit is for read, the second is for write, and the third is for execute.
A one gives permission and a zero denies it.
For example 0 110 100 100 is a file that gives you read and write permission, your group read permission,
    and everyone else read permission. 
Use ls -l to see the permissions.
Use chmod to change permissions. When using chmod we write each group of three digits in decimal (or octal),
    so 110 100 100 would be 644, thus the command is chmod 644 {filespec}.