03-28-2008
# cat shit | awk '{print $(NF-1)}'
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I'm now designing a server application which can serve large number of clients' request. I've a question to ask, that is, main process will block when invoke the "accept" function, if a client request comes, main process should be separated into 2 processes by invoking "fork" function, the parent... (4 Replies)
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2. UNIX for Advanced & Expert Users
well, my internet brakes down every day because of my server, i don't have troubles with RAM or anything i think... that problem started since i am running an unrealircd server...
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3. Programming
Try to solve this.....It's a nice program.....
#include<stdio.h>
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{
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void main()
{
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4. UNIX for Advanced & Expert Users
Hi, all,
The following commands could compute the 10 most frequent bigrams from a input sequence which is in a file infile.
I would like to know whether there is somebody who can use only two unix commands to do the same work.
--------------------
tr " " "\012*" <infile >out1
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5. UNIX for Advanced & Expert Users
Hi!
My unix os version is OSF1 CP1 V4.0 878 alpha.
It startup normally but it restarts within 5 sec.
I would like to know how to solve .
Please reply to me.
Thanks .
akzin (2 Replies)
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6. IP Networking
I have a Red Hat linux server X on a x.x.0.0 network. This machine also has to communicate with another server Y on a network called y.y.0.0
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7. Shell Programming and Scripting
Take a look on this code:
#!/bin/sh
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if ; then
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./runit
fi
else
#Root user
if ; then
rm -r /some
fi
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cd /home/
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8. Shell Programming and Scripting
Hi all,
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9. Shell Programming and Scripting
Hello,
I would really appreciate some help into approaching this problem:
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ex:
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CAT(1) BSD General Commands Manual CAT(1)
NAME
cat -- concatenate and print files
SYNOPSIS
cat [-benstuv] [file ...]
DESCRIPTION
The cat utility reads files sequentially, writing them to the standard output. The file operands are processed in command-line order. If
file is a single dash ('-') or absent, cat reads from the standard input. If file is a UNIX domain socket, cat connects to it and then reads
it until EOF. This complements the UNIX domain binding capability available in inetd(8).
The options are as follows:
-b Number the non-blank output lines, starting at 1.
-e Display non-printing characters (see the -v option), and display a dollar sign ('$') at the end of each line.
-n Number the output lines, starting at 1.
-s Squeeze multiple adjacent empty lines, causing the output to be single spaced.
-t Display non-printing characters (see the -v option), and display tab characters as '^I'.
-u Disable output buffering.
-v Display non-printing characters so they are visible. Control characters print as '^X' for control-X; the delete character (octal
0177) prints as '^?'. Non-ASCII characters (with the high bit set) are printed as 'M-' (for meta) followed by the character for the
low 7 bits.
EXIT STATUS
The cat utility exits 0 on success, and >0 if an error occurs.
EXAMPLES
The command:
cat file1
will print the contents of file1 to the standard output.
The command:
cat file1 file2 > file3
will sequentially print the contents of file1 and file2 to the file file3, truncating file3 if it already exists. See the manual page for
your shell (i.e., sh(1)) for more information on redirection.
The command:
cat file1 - file2 - file3
will print the contents of file1, print data it receives from the standard input until it receives an EOF ('^D') character, print the con-
tents of file2, read and output contents of the standard input again, then finally output the contents of file3. Note that if the standard
input referred to a file, the second dash on the command-line would have no effect, since the entire contents of the file would have already
been read and printed by cat when it encountered the first '-' operand.
SEE ALSO
head(1), more(1), pr(1), sh(1), tail(1), vis(1), zcat(1), setbuf(3)
Rob Pike, "UNIX Style, or cat -v Considered Harmful", USENIX Summer Conference Proceedings, 1983.
STANDARDS
The cat utility is compliant with the IEEE Std 1003.2-1992 (``POSIX.2'') specification.
The flags [-benstv] are extensions to the specification.
HISTORY
A cat utility appeared in Version 1 AT&T UNIX. Dennis Ritchie designed and wrote the first man page. It appears to have been cat(1).
BUGS
Because of the shell language mechanism used to perform output redirection, the command ``cat file1 file2 > file1'' will cause the original
data in file1 to be destroyed!
The cat utility does not recognize multibyte characters when the -t or -v option is in effect.
BSD
March 21, 2004 BSD