10-07-2004
If you have the memory, you might want to read the whole file into memory, manipulate it there and then dump the results back to disk.
That could be faster depending on a number of factors e.g number of search operations, insert/delete operations, disk performance or size of file.
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I'm trying to insert a single character at position 11 in everyline of a file.
My input file looks like this:
456781 ~Y~12345
456782 ~N~12300
and I want my output to look like this:
45678~1 ~Y~12345
45678~2 ~N~12300
I tried the following awk code, but it's not working:... (3 Replies)
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Script 1
Pre-requisites
Create a file with x amount of lines in it, the content of your choice.
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I wrote a script like
#!/bin/bash
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cat $2 >> temp
mv temp $2
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how to insert one file into another file not by concatenating as usual done.
file1
A B
C D
E F
G H
I J
K L
file2
23455
33444
33334
33345
Output shud be
23455
A B
C D (4 Replies)
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I want to insert a text into the middle of a file (3 Replies)
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Hey guys, how do we take a line of text as an argument from a user and then insert it in the middle of a file irrespective of the number of lines in the file. I am trying to do this without SED or AWK. Inserting it in the beginning and at the end is easy, but i am trying to accomplish inserting... (6 Replies)
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I have tried
sed '/6/a text_to_inserted' file > newfile
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Hi,
So far i've made a script that takes two argument, 1st is the contents and the 2nd is the named file. At the moment i've managed to insert new contents as a new line at the top, but i want to ask how can you insert contents in the middle of the file?
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All,
I have a file which contains two entry with spaces (either one or more than one space). ex.
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LEARN ABOUT OSX
vfs_cacheprime
VFS_CACHEPRIME(8) VFS_CACHEPRIME(8)
NAME
vfs_cacheprime - prime the kernel file data cache
SYNOPSIS
vfs objects = cacheprime
DESCRIPTION
This VFS module is part of the samba(7) suite.
The vfs_cacheprime VFS module reads chunks of file data near the range requested by clients in order to make sure the data is present in
the kernel file data cache at the time when it is actually requested by clients.
The size of the disk read operations performed by vfs_cacheprime is determined by the cacheprime:rsize option. All disk read operations are
aligned on boundaries that are a multiple of this size. Each range of the file data is primed at most once during the time the client has
the file open.
This module is stackable.
OPTIONS
cacheprime:rsize = BYTES
The number of bytes with which to prime the kernel data cache.
The following suffixes may be applied to BYTES:
o K - BYTES is a number of kilobytes
o M - BYTES is a number of megabytes
o G - BYTES is a number of gigabytes
EXAMPLES
For a hypothetical disk array, it is necessary to ensure that all read operations are of size 1 megabyte (1048576 bytes), and aligned on 1
megabyte boundaries:
[hypothetical]
vfs objects = cacheprime
cacheprime:rsize = 1M
CAVEATS
cacheprime is not a a substitute for a general-purpose readahead mechanism. It is intended for use only in very specific environments where
disk operations must be aligned and sized to known values (as much as that is possible).
VERSION
This man page is correct for version 3.0.25 of the Samba suite.
AUTHOR
The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by the Samba Team as an Open
Source project similar to the way the Linux kernel is developed.
VFS_CACHEPRIME(8)