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Implementing Pipelines (OPERATING SYSTEMS)

Exercise 5

The simple shell that we used in Lab 1 is to be extended so that the user can run command pipelines such as:

ls | wc

The parser already recognizes | and the function pipecmd has been created for you. The only code you must write

is for the '|' case in runcmd. You might find the man pages for pipe, fork, close, and dup useful.

Test that you can run the above pipeline. The wc program may be in the directory /usr/bin/ and in that case

you can type the absolute pathname /usr/bin/wc to run word-count. The command which wc can help find

which directory in the shell's search path has an executable named wc. Make sure you use the right absolute

pathnames for the programs.

Now you should be able to run the command correctly by using absolute pathnames:

$ /usr/bin/ls | /usr/bin/wc -l

Note: I have got the code from previous exercise

Taidot: C++ -ohjelmointi, C-ohjelmointi, Tietojärjestelmäarkkitehtuuri, Linux, Ubuntu

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( 11 arvostelua ) Manukau, New Zealand

Projektin tunnus: #30982069

5 freelanceria on tarjonnut keskimäärin $42 tähän työhön

kaloyan13

I have done shell tasks in Linux, and have expert skills in system programming. Piping processes is easy for me.

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aemgborgess

Hello i can handle this type of job for [login to view URL] free to message me. i will do my best in job for sure

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azaeffram3

========= Dear Client ========== I'm willing to work for you . I have good knowledge of c programming and doing many projects which based on c programming with 5+ years experiences. In addition, I am good at java, ja Lisää

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joshu134

Hi I am certified Linux systems administrator, i can do this for you with time and fair pricing in mind but theirs one aspect of your explanation i did not get clearly. I hope you can explain to me more.

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