Output of one program is input of another program Using Pipes

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Home » C Home » C on Unix Home » Output of one program is input of another program Using Pipes

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Title	Output of one program is input of another program Using Pipes
Author	Guru
Author Email	upanddown [at] imap.cc
Description	Output of one program is input of another program Using Pipes
Category	C » C on Unix
Hits	366751
Code	Select and Copy the Code
#include <unistd.h> #include <process.h> /* Pipe the output of program to the input of another. / int main() { int pipe_fds[2]; int stdin_save, stdout_save; if (pipe(pipe_fds) < 0) return -1; / Duplicate stdin and stdout so we can restore them later. / stdin_save = dup(STDIN_FILENO); stdout_save = dup(STDOUT_FILENO); / Make the write end of the pipe stdout. / dup2(pipe_fds[1], STDOUT_FILENO); / Run the program. Its output will be written to the pipe. / spawnl(P_WAIT, "/dev/env/DJDIR/bin/ls.exe", "ls.exe", NULL); / Close the write end of the pipe. / close(pipe_fds[1]); / Restore stdout. / dup2(stdout_save, STDOUT_FILENO); / Make the read end of the pipe stdin. / dup2(pipe_fds[0], STDIN_FILENO); / Run another program. Its input will come from the output of the first program. / spawnl(P_WAIT, "/dev/env/DJDIR/bin/less.exe", "less.exe", "-E", NULL); / Close the read end of the pipe. / close(pipe_fds[0]); / Restore stdin. */ dup2(stdin_save, STDIN_FILENO); return 0; }

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