Simple Linux Shell

Features

• Build-in commands: exit, pwd, cd, wait

mysh> cd			# change the working directory to $HOME
mysh> cd [dir]		# change the working directory to specific directory
mysh> pwd			# print working directory
/home/username
mysh> wait			# wait for background jobs to finish

• Externel commands: cat, echo, ls, ps, find... Depending on binary files in /bin/

mysh> echo hello
hello
mysh> ls -a
.  ..  .git  .gitignore  Makefile  README.md  mysh  mysh.c  test-mysh.sh

• Redirection: Both input and output redirection

mysh> ls -la /tmp > output	# output redirection
mysh> cat < mysh.c > tmp.c	# input and output redirection

• Background job: Use a trailing ampersand '&' to create background. Use wait to wait for background jobs to finish.

mysh> ls &
mysh> ps &
mysh> find . -name *.c -print &
mysh> wait

• Batch Mode: Read from the batch file back to the user before executing it. Use .\mysh [batch_file] . to run batch mode.

For example, the content of test.sh is as follows:

echo hello > tmp
cat tmp

bash> mysh test.sh
echo hello > tmp
cat tmp
hello