10-25-2007
unfortunately that still did not do the trick.
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1. Shell Programming and Scripting
Hi all
I need to strip blank lines from the end of a file. I have searched and found topics on how to strip lines from the entirety of a file - however I need to limit this to only the last 3-4 lines.
Any ideas?
Thanks (4 Replies)
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4 Replies
2. Shell Programming and Scripting
can't figure out a way to delete multiple empty lines but keep single empty lines in a file, file is like this
#cat file
1
2
3
4
5
6
-
What I want is
1
2 (6 Replies)
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3. UNIX for Dummies Questions & Answers
can anyone show me how to delete blank lines from a file.
thanks in advance (2 Replies)
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4. Shell Programming and Scripting
Hi,
I want to use diff to compare two files in a Perl file. But one of the files has some blank lines at the end. So I want to delete the blank lines from the file firstly and then use diff to compare them. But I dont know how to delete the blank lines from the files. Meanwhile, the system is... (5 Replies)
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5. Shell Programming and Scripting
Hi Guys,
I have a quetion which was already discussed in the forum, but for some reason all approches suggested fail for me.
I have a file which have blank lines at the body of the text as well as at the end. I need to delete ONLY blank lines at the end. Unfortunatly the approach below does not... (5 Replies)
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6. Shell Programming and Scripting
Hi,
Consider a file named "testfile"
The contents of file are as below
first line added for test
second line added for test
third line added for test
fourth line added for test
fifth line added for test (5 Replies)
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7. Shell Programming and Scripting
Hi All,
I have a file and I need to delete the lines that are blank and is starting with some characters below. Something like below:
Regular Ascii File:
Line1: AGODA1 BUSAN||SK Lord Beach 4/6/2012 4/7/2012 68060
Line2: AGODA2 BUSAN||SK Beach Hotel 4/6/2012 4/7/2012 610200
Line3: ... (4 Replies)
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Hi Gurus,
Somebody can say me how to delete blank spaces and blank lines in a file unix, please.
Thank you for advanced. (10 Replies)
Discussion started by: systemoper
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9. Shell Programming and Scripting
Hi,
I tried the following options but was unable to delete blank lines from file
Input file = temp.hash.txt
temp.hash.txt content
90
0
89.56
0
0
57575.4544
56.89 (9 Replies)
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Hi, In my previous post ( How to print lines from a files with specific start and end patterns and pick only the last lines? ), i have got a help to get the last select statement from a file, now i need to remove/exclude the output from main file:
Input File format:
SELECT
ABCD,
DEFGH,... (2 Replies)
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LEARN ABOUT CENTOS
trace_printk
TRACE_PRINTK(9) Driver Basics TRACE_PRINTK(9)
NAME
trace_printk - printf formatting in the ftrace buffer
SYNOPSIS
trace_printk(fmt, ...);
ARGUMENTS
fmt
the printf format for printing
...
variable arguments
NOTE
__trace_printk is an internal function for trace_printk and the ip is passed in via the trace_printk macro.
This function allows a kernel developer to debug fast path sections that printk is not appropriate for. By scattering in various printk
like tracing in the code, a developer can quickly see where problems are occurring.
This is intended as a debugging tool for the developer only. Please refrain from leaving trace_printks scattered around in your code.
(Extra memory is used for special buffers that are allocated when trace_printk is used)
A little optization trick is done here. If there's only one argument, there's no need to scan the string for printf formats. The trace_puts
will suffice. But how can we take advantage of using trace_puts when trace_printk has only one argument? By stringifying the args and
checking the size we can tell whether or not there are args. __stringify((__VA_ARGS__)) will turn into "() " with a size of 3 when there
are no args, anything else will be bigger. All we need to do is define a string to this, and then take its size and compare to 3. If it's
bigger, use do_trace_printk otherwise, optimize it to trace_puts. Then just let gcc optimize the rest.
COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 TRACE_PRINTK(9)