10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi,
i was tried using the awk command for replacing '-' in the second column. but the below command replacing the entire file.
cat 1.txt |awk '{gsub(/-/,"")}1'
Input file
1,2,3,-4,5,6
1,-2,3,4,5,-6
1,2,3,4,5,6
1,-2,3,4,-5,6
Output file
1,2,3,-4,5,6
1,2,3,4,5,-6
1,2,3,4,5,6... (3 Replies)
Discussion started by: onesuri
3 Replies
2. Shell Programming and Scripting
Hello,
I'm strugling with some redirecting and all help is apreciated.
The following program is working as expected, but the result of the AT command doesn't go to any file.
Thanks in advance for the help.
#!/bin/bash
modem=/dev/ttyUSB1
file=/root/imsi.txt
# print error to stderr and exit... (4 Replies)
Discussion started by: cleitao
4 Replies
3. Shell Programming and Scripting
Hi,
Please help with this.
I have several excel files (with and .xlsx format) with 10-15 columns each.
They all have the same type of data but the columns are not ordered in the same way.
Here is a 3 column example. What I want to do add the alphabet
from column 2 to column 3, provided... (9 Replies)
Discussion started by: newbie83
9 Replies
4. Shell Programming and Scripting
Hello,
I have some tab delimited data and I need to move the last col. I could hard code it,
awk '{ print $1,$NF,$2,$3,$4,etc }' infile > outfile
but it would be nice to know the syntax to print a range cols.
I know in cut you can do,
cut -f 1,4-8,11-
to print fields 1,... (8 Replies)
Discussion started by: LMHmedchem
8 Replies
5. UNIX for Advanced & Expert Users
Hello everyone,
I am writing a script to process data from the ATP world tour.
I have a file which contains:
t=540 y=2011 r=1 p=N409
t=540 y=2011 r=2 p=N409
t=540 y=2011 r=3 p=N409
t=540 y=2011 r=4 p=N409
t=520 y=2011 r=1 p=N409
t=520 y=2011 r=2 p=N409
t=520 y=2011 r=3 p=N409
The... (4 Replies)
Discussion started by: imahmoud
4 Replies
6. Shell Programming and Scripting
can anyone help me in making singleline command for
Capital Letters are folders ,small letter are files
X,Y,Z are subfolders of A
as shown below
A - X,Y,Z
Folder X has three files a.txt,b.txt,c.txt similarly Y,Z.
as shown below
X- a.txt,b.txt,c.txt
Y- a.txt,b.txt,c.txt
Z-... (4 Replies)
Discussion started by: phoenix_nebula
4 Replies
7. Programming
Hi,
Currently my STDOUT is configured as tty0,
Is there a way to change it during runtime?
I need to use this serial for other external device
Thanks,
Alex (2 Replies)
Discussion started by: alex889
2 Replies
8. UNIX for Dummies Questions & Answers
Hello every1.
Can any1 help me with the col command.
Wat is a reverse line feed.
Which kind of files u need to use the col command. (2 Replies)
Discussion started by: rahulrathod
2 Replies
9. UNIX for Advanced & Expert Users
Hi All,
I am talking about unix col(1) command used for some reverse line filtering etc.
And I notice that the stdout of this command is line buffered i.e. the stdout will flush the data in its buffer line by line. So the number of writes performed by stdout are more.
So now if I make stdout... (0 Replies)
Discussion started by: sunilsbjoshi
0 Replies
10. UNIX for Advanced & Expert Users
Hello Can Any1 tell me the difference between the col command and the col command with the -f option.
I tried running both of them but i can't see any difference.
Please guide me. (1 Reply)
Discussion started by: rahulrathod
1 Replies
LIBSTDBUF(3) BSD Library Functions Manual LIBSTDBUF(3)
NAME
libstdbuf -- preloaded library to change standard streams initial buffering
DESCRIPTION
The libstdbuf library is meant to be preloaded with the LD_PRELOAD environment variable to as to change the initial buffering of standard
input, standard output and standard error streams.
Although you may load and configure this library manually, an utility, stdbuf(1), can be used to run a command with the appropriate environ-
ment variables.
ENVIRONMENT
Each stream can be configured independently through the following environment variables (values are defined below):
_STDBUF_I
Initial buffering definition for the standard input stream
_STDBUF_O
Initial buffering definition for the standard output stream
_STDBUF_E
Initial buffering definition for the standard error stream
Each variable may take one of the following values:
"0" unbuffered
"L" line buffered
"B" fully buffered with the default buffer size
size fully buffered with a buffer of size bytes (suffixes 'k', 'M' and 'G' are accepted)
EXAMPLE
In the following example, the stdout stream of the awk(1) command will be fully buffered by default because it does not refer to a terminal.
libstdbuf is used to force it to be line-buffered so vmstat(8)'s output will not stall until the full buffer fills.
# vmstat 1 | LD_PRELOAD=/usr/lib/libstdbuf.so
STDBUF_1=L awk '$2 > 1 || $3 > 1' | cat -n
See also the manpage of stdbuf(1) for a simpler way to do this.
HISTORY
The libstdbuf library first appeared in FreeBSD 8.4.
AUTHORS
The original idea of the libstdbuf command comes from Padraig Brady who implemented it in the GNU coreutils. Jeremie Le Hen implemented it
on FreeBSD.
BSD
April 28, 2012 BSD