08-17-2008
you mean you wanna replicate line 4 as line 6??
if so use...
head -4|tail -1 filename >> filename
this appends line 4 as line 6 in you file..
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I have a file that is populated:
hits/books.hits:143.217.64.204 Thu Sep 21 22:24:57 GMT 2006
hits/books.hits:62.145.39.14 Fri Sep 22 00:38:32 GMT 2006
hits/books.hits:81.140.86.170 Fri Sep 22 08:45:26 GMT 2006
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Hi All,
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Hi, my dilemna is this:
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WAS.sun5 CC
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Hi,
I have several files that look like this:
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Data2
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Is it possible to replicate the lines based on 4th column of the input like the below ?
input
ar1 10 100 -1
ar1 20 200 -2
arX 34 140 +1
arY 7 1 +4
output
ar1 10 100 -
ar1 20 200 -
ar1 20 200 -
arX 34 140 +
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We usually use the following awk code to delete of find out the replicate record.
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File 1
ID Name Po1 Po2
DD134 DD134_4A_1 NN-1 L_0_1
DD134 DD134_4B_1 NN-2 L_1_1
DD134 DD134_4C_1 NN-3 L_2_1
DD142 DD142_4A_1 NN-1 L_0_1
DD142 DD142_4B_1 NN-2 L_1_1
DD142 DD142_4C_1 NN-3 L_2_1
DD142 DD142_3A_1 NN-41 L_3_1
DD142 DD142_3A_1 NN-42 L_3_2
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Hi All,
I have a file like this(having 2 column).
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LEARN ABOUT OPENDARWIN
tail
TAIL(1) BSD General Commands Manual TAIL(1)
NAME
tail -- display the last part of a file
SYNOPSIS
tail [-F | -f | -r] [-b number | -c number | -n number] [file ...]
DESCRIPTION
The tail utility displays the contents of file or, by default, its standard input, to the standard output.
The display begins at a byte, line or 512-byte block location in the input. Numbers having a leading plus (``+'') sign are relative to the
beginning of the input, for example, ``-c +2'' starts the display at the second byte of the input. Numbers having a leading minus (``-'')
sign or no explicit sign are relative to the end of the input, for example, ``-n 2'' displays the last two lines of the input. The default
starting location is ``-n 10'', or the last 10 lines of the input.
The options are as follows:
-b number
The location is number 512-byte blocks.
-c number
The location is number bytes.
-f The -f option causes tail to not stop when end of file is reached, but rather to wait for additional data to be appended to the
input. The -f option is ignored if the standard input is a pipe, but not if it is a FIFO.
-F The -F option implies the -f option, but tail will also check to see if the file being followed has been renamed or rotated. The
file is closed and reopened when tail detects that the filename being read from has a new inode number. The -F option is ignored if
reading from standard input rather than a file.
-n number
The location is number lines.
-r The -r option causes the input to be displayed in reverse order, by line. Additionally, this option changes the meaning of the -b,
-c and -n options. When the -r option is specified, these options specify the number of bytes, lines or 512-byte blocks to display,
instead of the bytes, lines or blocks from the beginning or end of the input from which to begin the display. The default for the -r
option is to display all of the input.
If more than a single file is specified, each file is preceded by a header consisting of the string ``==> XXX <=='' where ``XXX'' is the name
of the file.
DIAGNOSTICS
The tail utility exits 0 on success, and >0 if an error occurs.
SEE ALSO
cat(1), head(1), sed(1)
STANDARDS
The tail utility is expected to be a superset of the IEEE Std 1003.2-1992 (``POSIX.2'') specification. In particular, the -F, -b and -r
options are extensions to that standard.
The historic command line syntax of tail is supported by this implementation. The only difference between this implementation and historic
versions of tail, once the command line syntax translation has been done, is that the -b, -c and -n options modify the -r option, i.e. ``-r
-c 4'' displays the last 4 characters of the last line of the input, while the historic tail (using the historic syntax ``-4cr'') would
ignore the -c option and display the last 4 lines of the input.
HISTORY
A tail command appeared in PWB UNIX.
BSD
June 6, 1993 BSD