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Annotation of 43BSD/usr.lib/learn/morefiles/L5.1b, revision 1.1.1.1

1.1       root        1: #print
                      2: It seems silly to use a temporary file when all that's really
                      3: needed is to take the output from one program like "ls",
                      4: and pass it directly to the input of another, like "wc".
                      5: One of the original contributions of Unix is a clean
                      6: way to do this, called a "pipe".  You can connect two
                      7: programs with a pipe like this:
                      8:   ls | wc
                      9: and the output of the first program goes into the input of
                     10: the second without any intervening file.
                     11: 
                     12: Try this pair of commands in a pipeline.
                     13: Try an ordinary "ls" command too, to verify that you
                     14: got the right answer.  Then type "ready".
                     15: #create X1
                     16: #copyin
                     17: #user
                     18: #uncopyin
                     19: grep 'ls *| *wc' .copy >/dev/null
                     20: #log
                     21: #next
                     22: 5.1c

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