09-08-2014
Any attempts from your side?
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1. Shell Programming and Scripting
hello everyone..
I was wondering is there a effective way to sort file that contains colomns and numeric one.
file
218900012192 8938929 8B8DF3664 1E7E2D59D5 0000 26538 1234 74024415
218900012979 8938929 8B8DF3664 1E7E2D59D5 0000 26538 1234 74024415
218900012992 8938929 8B8DF3664... (2 Replies)
Discussion started by: amon
2 Replies
2. UNIX for Dummies Questions & Answers
Hi power user,
if I have this file:
file1.txt:
1111
1111
2222
2222
3333
3333
3333
4444
4444
4444
when I run the
sort file1.txt | uniq > data1.txt
the result is (2 Replies)
Discussion started by: anjas
2 Replies
3. UNIX for Dummies Questions & Answers
I don't really know much about UNIX commands, so if someone could help me understand how to do this, I'd really appreciate it.
I have a text file with data that looks like this (filename: numbers.txt):
1 1 1 1 1 1 1 1 1 2 1 1_2 2_1
1 1 1 1 1 1 1 1 2 1 2 1_2 2_1
1 1 1 1 1 1 1 1 2 1 2 1_2 2_1... (12 Replies)
Discussion started by: zac100
12 Replies
4. Shell Programming and Scripting
Hi Guys,
I have two files that I am using:
File1 is as follows:
wwe
khfgv
jfo
jhgfd
hoaha
hao
lkahe
This is like a master file which has entries in the order which I want. (4 Replies)
Discussion started by: npatwardhan
4 Replies
5. Shell Programming and Scripting
hello,
I have a file as follows:
F0100010 A C F0100040 A G BTA-28763-no-rs 77.2692
F0100020 A G F0100030 A T BTA-29334-no-rs 11.4989
F0100030 A T F0100020 A G BTA-29515-no-rs 127.006
F0100040 A G F0100010 A C BTA-29644-no-rs 7.29827
F0100050 A... (9 Replies)
Discussion started by: Homa
9 Replies
6. UNIX for Dummies Questions & Answers
Hi all,
I wanted to save the values of a file that contains unique entries based on a specific column (column 4). my sample file looks like the following:
input file: 200006-07file.txt
145 35 10 3
147 35 12 4
146 36 11 3
145 34 12 5
143 31 15 4
146 30 14 5
desired output files:... (5 Replies)
Discussion started by: ida1215
5 Replies
7. Shell Programming and Scripting
Hi ,
i have a belwo script which is used to get sectors per track value extarcted from Solaris machine:
for DISK in /dev/dsk/c*t*d*s*; do value=`prtvtoc "$DISK" | sed -n -e '/Dimensions/,/Flags/{/Dimensions/d; /Flags/d; p; }' | sed -n -e '/sectors\/track/p'`; if ; then echo... (4 Replies)
Discussion started by: omkar.jadhav
4 Replies
8. Shell Programming and Scripting
Hello Team,
I need your help on the following:
My input file a.txt is as below:
3330690|373846|108471
3330690|373846|108471
0640829|459725|100001
0640829|459725|100001
3330690|373847|108471
Here row 1 and row 2 of column 1 are identical but corresponding column 2 value are... (4 Replies)
Discussion started by: angshuman
4 Replies
9. UNIX for Beginners Questions & Answers
Hello,
I am trying to count unique rows in my file based on 4 columns (2-5) and to output its frequency in a sixth column. My file is tab delimited
My input file looks like this:
Colum1 Colum2 Colum3 Colum4 Coulmn5
1.1 100 100 a b
1.1 100 100 a c
1.2 200 205 a d
1.3 300 301 a y
1.3 300... (6 Replies)
Discussion started by: nans
6 Replies
READ(2) Linux Programmer's Manual READ(2)
NAME
read - read from a file descriptor
SYNOPSIS
#include <unistd.h>
ssize_t read(int fd, void *buf, size_t count);
DESCRIPTION
read() attempts to read up to count bytes from file descriptor fd into the buffer starting at buf.
If count is zero, read() returns zero and has no other results. If count is greater than SSIZE_MAX, the result is unspecified.
RETURN VALUE
On success, the number of bytes read is returned (zero indicates end of file), and the file position is advanced by this number. It is not
an error if this number is smaller than the number of bytes requested; this may happen for example because fewer bytes are actually avail-
able right now (maybe because we were close to end-of-file, or because we are reading from a pipe, or from a terminal), or because read()
was interrupted by a signal. On error, -1 is returned, and errno is set appropriately. In this case it is left unspecified whether the
file position (if any) changes.
ERRORS
EINTR The call was interrupted by a signal before any data was read.
EAGAIN Non-blocking I/O has been selected using O_NONBLOCK and no data was immediately available for reading.
EIO I/O error. This will happen for example when the process is in a background process group, tries to read from its controlling tty,
and either it is ignoring or blocking SIGTTIN or its process group is orphaned. It may also occur when there is a low-level I/O
error while reading from a disk or tape.
EISDIR fd refers to a directory.
EBADF fd is not a valid file descriptor or is not open for reading.
EINVAL fd is attached to an object which is unsuitable for reading.
EFAULT buf is outside your accessible address space.
Other errors may occur, depending on the object connected to fd. POSIX allows a read that is interrupted after reading some data to return
-1 (with errno set to EINTR) or to return the number of bytes already read.
CONFORMING TO
SVr4, SVID, AT&T, POSIX, X/OPEN, BSD 4.3
RESTRICTIONS
On NFS file systems, reading small amounts of data will only update the time stamp the first time, subsequent calls may not do so. This is
caused by client side attribute caching, because most if not all NFS clients leave atime updates to the server and client side reads satis-
fied from the client's cache will not cause atime updates on the server as there are no server side reads. UNIX semantics can be obtained
by disabling client side attribute caching, but in most situations this will substantially increase server load and decrease performance.
Many filesystems and disks were considered to be fast enough that the implementation of O_NONBLOCK was deemed unneccesary. So, O_NONBLOCK
may not be available on files and/or disks.
SEE ALSO
close(2), fcntl(2), ioctl(2), lseek(2), readdir(2), readlink(2), select(2), write(2), fread(3), readv(3)
Linux 2.0.32 1997-07-12 READ(2)