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1. UNIX for Beginners Questions & Answers
Hi,
I have a txt document having a format like this:
DATA1 | DATA2 | DATA3 | 23-JAN-20 23:41:34
DATA1 | DATA2 | DATA3 | 23-JAN-20 23:41:32
DATA1 | DATA2 | DATA3 | 23-JAN-20 23:41:30
...
DATA1 | DATA2 | DATA3 | 23-JAN-20 22:35:31
DATA1 | DATA2 | DATA3 | 23-JAN-20 22:30:34
DATA1 | DATA2 |... (1 Reply)
Discussion started by: gc_sw
1 Replies
2. Shell Programming and Scripting
Hello,
I have file of more than 10000 lines.
I want to delete 40 lines after every 20 lines.
e.g from a huge file, i want to delete line no from 34 - 74, then 94 - 134 etc and so on.
Please let me know how i can do it.
Best regards, (11 Replies)
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Hi,
I need a unix command to delete first n (say 100) lines from a log file. I need to delete some lines from the file without using any temporary file. I found sed -i is an useful command for this but its not supported in my environment( AIX 6.1 ). File size is approx 100MB.
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4. UNIX for Advanced & Expert Users
Hi All,
I have a very huge file (4GB) which has duplicate lines. I want to delete duplicate lines leaving unique lines. Sort, uniq, awk '!x++' are not working as its running out of buffer space.
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5. UNIX for Dummies Questions & Answers
Hiiii
I have a file which contains huge data as
a.dat:
PDE 1990 1 9 18 51 28.90 24.7500 95.2800 118.0 6.1 0.0 BURMA
event name: 010990D
time shift: 7.3000
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latitude: 24.4200
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Mrr: ... (7 Replies)
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6. Shell Programming and Scripting
Input:
a
b
b
c
d
d
I need:
a
c
I know how to get this (the lines that have duplicates) :
b
d
sort file | uniq -d
But i need opossite of this. I have searched the forum and other places as well, but have found solution for everything except this variant of the problem. (3 Replies)
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7. UNIX for Dummies Questions & Answers
hello... I have a file with a list of filepaths in it, like so:
delMe.txt (files to be deleted)
./root/index.php
./root/language/se/home.inc.php
./root/language/pl/home.inc.php
Now here's what I'm trying to do. I want any lines in the above file (delMe.txt) to be deleted out of the... (3 Replies)
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8. Shell Programming and Scripting
Dear All,
I m trying to delete two lines at a time in file called 123.txt. Im using sed and based on line numbers i m deleting it and writing it to another file. Follwing i have done.
cat 123.txt | sed '1,5 d' > new
I want to delete line no 1 and 5 at a time, for that i m using... (6 Replies)
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9. Solaris
Hi experts,
in my solaris 9 the file- /var/adm/messeages growin too first. by 24 hours 40MB. And always giving the below messages--
bash-2.05# tail -f messages
Nov 9 16:35:38 ME1 last message repeated 1 time
Nov 9 16:35:38 ME1 ftpd: wtmpx /var/adm/wtmpx No such file or directory
Nov 9... (7 Replies)
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10. UNIX for Dummies Questions & Answers
how can i delete all lines in file by using "vi" ? (6 Replies)
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tail(1) User Commands tail(1)
NAME
tail - deliver the last part of a file
SYNOPSIS
/usr/bin/tail [+-s number [lbcr]] [file]
/usr/bin/tail [-lbcr] [file]
/usr/bin/tail [+- number [lbcf]] [file]
/usr/bin/tail [-lbcf] [file]
/usr/xpg4/bin/tail [-f | -r] [-c number | -n number] [file]
/usr/xpg4/bin/tail [+- number [l | b | c] [f]] [file]
/usr/xpg4/bin/tail [+- number [l] [f | r]] [file]
DESCRIPTION
The tail utility copies the named file to the standard output beginning at a designated place. If no file is named, the standard input is
used.
Copying begins at a point in the file indicated by the -cnumber, -nnumber, or +-number options (if +number is specified, begins at distance
number from the beginning; if -number is specified, from the end of the input; if number is NULL, the value 10 is assumed). number is
counted in units of lines or byte according to the -c or -n options, or lines, blocks, or bytes, according to the appended option l, b,
or c. When no units are specified, counting is by lines.
OPTIONS
The following options are supported for both /usr/bin/tail and /usr/xpg4/bin/tail. The -r and -f options are mutually exclusive. If both
are specified on the command line, the -f option is ignored.
-b Units of blocks.
-c Units of bytes.
-f Follow. If the input-file is not a pipe, the program does not terminate after the line of the input-file has been copied, but enters
an endless loop, wherein it sleeps for a second and then attempts to read and copy further records from the input-file. Thus it can
be used to monitor the growth of a file that is being written by some other process.
-l Units of lines.
-r Reverse. Copies lines from the specified starting point in the file in reverse order. The default for r is to print the entire file
in reverse order.
/usr/xpg4/bin/tail
The following options are supported for /usr/xpg4/bin/tail only:
-c number The number option-argument must be a decimal integer whose sign affects the location in the file, measured in bytes, to begin
the copying:
+ Copying starts relative to the beginning of the file.
- Copying starts relative to the end of the file.
none Copying starts relative to the end of the file.
The origin for counting is 1; that is, -c+1 represents the first byte of the file, -c-1 the last.
-n number Equivalent to -cnumber, except the starting location in the file is measured in lines instead of bytes. The origin for count-
ing is 1. That is, -n+1 represents the first line of the file, -n-1 the last.
OPERANDS
The following operand is supported:
file A path name of an input file. If no file operands are specified, the standard input is used.
USAGE
See largefile(5) for the description of the behavior of tail when encountering files greater than or equal to 2 Gbyte ( 2^31 bytes).
EXAMPLES
Example 1 Using the tail Command
The following command prints the last ten lines of the file fred, followed by any lines that are appended to fred between the time tail is
initiated and killed.
example% tail -f fred
The next command prints the last 15 bytes of the file fred, followed by any lines that are appended to fred between the time tail is initi-
ated and killed:
example% tail -15cf fred
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of tail: LANG, LC_ALL, LC_CTYPE, LC_MES-
SAGES, and NLSPATH.
EXIT STATUS
The following exit values are returned:
0 Successful completion.
>0 An error occurred.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
/usr/bin/tail
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
|CSI |Enabled |
+-----------------------------+-----------------------------+
/usr/xpg4/bin/tail
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWxcu4 |
+-----------------------------+-----------------------------+
|CSI |Enabled |
+-----------------------------+-----------------------------+
|Interface Stability |Standard |
+-----------------------------+-----------------------------+
SEE ALSO
cat(1), head(1), more(1), pg(1), dd(1M), attributes(5), environ(5), largefile(5), standards(5)
NOTES
Piped tails relative to the end of the file are stored in a buffer, and thus are limited in length. Various kinds of anomalous behavior can
happen with character special files.
SunOS 5.11 13 Jul 2005 tail(1)