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Maintain the existing shell's frame.
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Doesn't modify the output from the shell in the existing frame.
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In shell's prompt, user, host and cwd are showed. and they could be distinguished by their specified colors.
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[ exit ] : exit shell
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[ cd ] : change directories
ex> cd .. / cd [dir]
+> if the directory doesn't exist, an error exist
- [ ls ] : list
ex> ls / ls -al / ls -l etc... (every option)
+> if there is no commands option, an error exist
- [ mkdir ] : make directory
ex> mkdir [dir], mkdir -m [dir], mkdir -v [dir] ...etc (every option)
- [ rmdir ] : remove directory
ex> rmdir [dir], rmdir -p [dir], rmdir -v [dir] (every option)
- [ rm ] : remove files or directory
ex> rm [file], rm -f [file], rm -i [file] ...etc (every option)
- [ mv ] : move files or directory to another directory
ex> mv [file], mv -b [file], mv -f [file] ...etc (every option)
- [ echo ] : print texts or input string combined " "
ex> echo [input], echo -n [input], echo -e [with commands like \a, \v, \r, \t, \c...] ...etc (every option except *)
- [ sleep ] : stop (sleep) the shell for a given time (input)
ex> sleep 1s (second), sleep 1m (minute) ...etc (every option)
- [ date ] : Today's year, month, day, day, time, etc. are printed.
ex> date
- [ touch ] : Initialize the timestamp of the file to the current or create a new file
ex> touch [file], touch [file1] [file2] ...etc (support until 3 files)
- [ chmod ] : Change the file's or directory's mode (authority)
ex> chmod [mode] [file], chmod 777 a.out, chmod +x a.out ...etc
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[ pipe_write ] : using [ popen ] function with 'writing mode' and [ pclose ] to print out list of current directory. [ls -l]
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[ pipe_read ] : using [ popen ] function with 'reading mode' and [ pclose ] to print out the date command. [date]
ex> type [ pipe_write ] or [ pipe_read ] in the shell and check the result.