ICSH

Tag 0.1.0 Interactive command-line interpreter

echo : print text on the console
!! : repeat the last command
exit : exit with the given exit code

Tag 0.2.0 Script mode

./icsh test.sh : return the input command content in the test.sh (in the current directory) to the console

Tag 0.3.0 Running an external program in the foreground

run the command that already exist in SHELL

Tag 0.4.0 Signal Handler

Ctrl+Z : to suspend the process in the current foreground (not your shell)
Ctrl+C : to kill the process in the current foreground (not your shell)
echo $? : to print the exit status code of the previous command. You may assume that all build-in commands exits with exit code 0

Tag 0.5.0 I/O redirection

reDir() : <Input/ >Output Redirection

Tag 0.6.0 Background jobs and job control

command followed by "&" : will run as a background job
- listed in the jobList[100] with 100 jobs limit
jobs : this command will list all the current jobs that are running/stopped
fg %<job_id> : Brings the job identified by <job_id> into the foreground
- does not continue, but start from the beginning
bg %<job_id> : Execute the suspended job identified by <job_id> in the background
- does not continue, but start from the beginning, run in fg instead

Tag 0.7.0 Extra features

Allowing users to customize their prompt at the beginning of the program
- Can type the prompt text
- Choose a font color (pink/red/green/yellow/blue/white)
- Choose styles (bold,underline)
- Or choose the default version "icsh $ "
help() : this command return the instructions of this IC SHELL
!!!! : repeat the second last command