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# README for Hank Shell (Hsh) # Hsh is a simplified version of BASH. [How to use hsh]: (1) First you need to install gnu readline library: $ sudo apt-get install libreadline6 libreadline6-dev (2) Second you need to compile and install hsh: Run 'make' in the 'src/' sub-directory ==> $ make [Hsh Features]: (1) Below lists all (9) the builtin commands implemented in Hank Shell: cd : change current working directory dirs : list pushed directories on the directory stack exit : terminate exeucution of hsh echo : echo strings that follow this command history : show commands history pwd : print current working directory pushd : push directory onto a directory stack popd : pop directory from directory stack path : list command search paths from command paths list and add/remove path(s) from that list (2) Builtin commands details: cd [dir] : change directory to dir. If dir is omitted, change directory to home directory. dirs : print directories pushed on directory stack; seperated by spaces. exit : exiting hsh program. echo [s] : print whatever texts followed echo commands. history [+n] : show n commands stored in command history list; if 'n' or '+n' is omitted, hsh will list all the commands in command history. pwd : print current working directory pushd [dir] : same as 'cd', but push current working directory onto directory stack while doing 'cd'. directory stack is a hsh internal data structure. popd [-n] : opposite of 'pushd'. option '-n' specify how many entries from stack you want to pop. path [+|-] [dir] : add or remove dir from directory path list. if both '+|-' and 'dir' arguments omitted, hsh will print all the directories in the list. the list is a hsh internal data structure. (3) IO redirection: Commands like 'cat < main.c > tmp' can be interpreted by Hsh! (4) Pipeline with IO redirection: Hsh can read pipes ('|')! Commands such as - $ pwd | grep main | cut -b 1-10 $ a | b | c | d | e $ cat < main.c | wc $ tr 'A-Z' 'a-z' < main.c | tr -cs 'a-z' '\n' | sort | uniq | comm -23 - /usr/share/dict/words > tmp 2> err.txt can be executed beautifully without any problems. Also notice that pipes in Hsh can pipe system utilities as well as builtin commands! (5) Environmental variables: Two environmental variables are implemented, namely, HOME and PWD. Therefore, $ echo $HOME $ echo $PWD can also be interpreted correctly. (6) 'Globbing' for Hsh: Yes! Hsh can do globbing! The followings $ ls *.c $ ls test[1-3].c $ ls hsh.* | wc are all doing what you are expecting them to do!