Good afternoon,
I have just messed up and deleted some directories on my UNIX machine.
I would now want to know which packages are impacted by this. Therefore I have a look in the file "/var/sadm/install/contents" (which contains the filenames/directory names for each installation package). After this, I add "ls " in front and "1>/dev/null" at the back, so I get following result:
=> I intend only to see which files/directories have been erased that belong to the package. When there are none, nothing needs to be done. When there are some, the package needs to be re-installed.
In order to do this, I need to launch the "ls ..." output.
I have already tried using a "| eval" behind it, but this does not work.
Does anybody have an idea?
Thanks
Dominique
Last edited by Scott; 04-24-2012 at 09:19 AM..
Reason: Code tags
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Discussion started by: rohit_shinez
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LEARN ABOUT OPENDARWIN
pipe
PIPE(2) BSD System Calls Manual PIPE(2)NAME
pipe -- create descriptor pair for interprocess communication
SYNOPSIS
#include <unistd.h>
int
pipe(int *fildes);
DESCRIPTION
The pipe() function creates a pipe, which is an object allowing unidirectional data flow, and allocates a pair of file descriptors. The
first descriptor connects to the read end of the pipe, and the second connects to the write end, so that data written to fildes[1] appears on
(i.e., can be read from) fildes[0]. This allows the output of one program to be sent to another program: the source's standard output is set
up to be the write end of the pipe, and the sink's standard input is set up to be the read end of the pipe. The pipe itself persists until
all its associated descriptors are closed.
A pipe whose read or write end has been closed is considered widowed. Writing on such a pipe causes the writing process to receive a SIGPIPE
signal. Widowing a pipe is the only way to deliver end-of-file to a reader: after the reader consumes any buffered data, reading a widowed
pipe returns a zero count.
RETURN VALUES
On successful creation of the pipe, zero is returned. Otherwise, a value of -1 is returned and the variable errno set to indicate the error.
ERRORS
The pipe() call will fail if:
[EMFILE] Too many descriptors are active.
[ENFILE] The system file table is full.
[EFAULT] The fildes buffer is in an invalid area of the process's address space.
SEE ALSO sh(1), read(2), write(2), fork(2), socketpair(2)HISTORY
A pipe() function call appeared in Version 6 AT&T UNIX.
4th Berkeley Distribution June 4, 1993 4th Berkeley Distribution