//linux commands
compgen -c will list all the commands you could run.
compgen -a will list all the aliases you could run.
compgen -b will list all the built-ins you could run.
compgen -k will list all the keywords you could run.
compgen -A function will list all the functions you could run.
compgen -A function -abck will list all the above in one go.

compgen -ac | wc -l

The following command can be executed in Terminal mode and shell programming.


//clear screen
clear

//help all commands
//command --help
ls --help

//manual for all commands
//man command
man ls

//creating soft links
ln -s sourceDir targetName  
do a ls to show how it is displayed

//list directory
ls                         
ls -la

//wildcards
ls *.c 

//make directory
mkdir name
    //relative vs absolute locations
mkdir ../name

//change directory
cd ../   ../../  ~   /  etc

//what is a file, type of files
//create files
touch fileName

//display a file
cat fileName

//display parts of a file
head -5 fileName
tail -5 fileName

//pipe, simple
cat fileName | less
cat fileName | more

//copy   
//can use multiple locations types (relative, absolute)
cp sourceFile destinationFile

//rename - move   
//can use multiple locations types (relative, absolute)
mv sourceFile destinationFile

//delete file
rm fileName

//delete folder
//most be empty
rmdir directoryName

//locate files
locate *.tmp

//find files
find -name 

//redirecting output
locate *.c > cPrograms

//parsing files
grep a *.*