Hi All,
I have huge xml file. The file contains some comment tags . I have requirement to replace comment tag with another comment tag.
Say for example : file X has -- Part of the file
<?xml version="1.0" encoding="ISO-2"?><translationResults jobDate="20070123 23:20:51"... (1 Reply)
Hi,
Apologies if this has been asked before, but I searched and was not able to find an answer. It's probably a simple question to answer for those of you with some experience, though...
I have a relatively long string where tokens are separated by the colon (':') character. Let's say the... (10 Replies)
I was wondering if somebody could help me with something on UNIX. I have a file that looks like this -
"nelson,bill","bill","123 Main St","Mpls","MN",55444,8877,william
I want to replace all comma with pipes (|), except if the comma is within double quotes. (The first field is an example of... (8 Replies)
Hello all,
This is my first post here, so please excuse me if this question is too obvious or has been asked before. I am new to Unix and although I tried to search your forum for the answer to my question, I could not find an answer that would help me.
I have a 500MB csv file with numeric values... (1 Reply)
Hi,
I have a file with 40 columns out of which 15 are amount fields. There are approximately 6 mn records in this file.
The file has data in following format:
123A,Ank,00.468,US,IL,780,53489
253A,Tng,-00.456,US,CA,452,46781
363A,nkk,-00.023,US,NJ,539,09625
I need to take all amount fields... (1 Reply)
sed -e "s// /g" old.txt > new.txt
While I do know some control characters need to be escaped, can normal characters also be escaped and still work the same way? Basically I do not know all control characters that have a special meaning, for example, ?, ., % have a meaning and have to be escaped... (11 Replies)
Hi guys,
First off, i'm a complete noob to UNIX and LINUX so apologies if I don't understand the basics!
I have a file which contains a hex value of '0D' at the end of each line when I look at it in a hex viewer.
I need to change it so it contains a hex value of '0D0A0A'
I thought... (10 Replies)
Suppose I have a file which has 1000 columns (5 SHOWN FOR EXAMPLE)
two alphabets are separated by a space and then tab
A A"\t"C C"\t"G G"\t"0 0"\t"T T
A G"\t"C C"\t"G G"\t"A T"\t"0 0
G A"\t"0 0"\t"G C"\t"A A"\t"T C
whenever there is a 0 0 in any column, the output should be printed as
A... (12 Replies)
Hi,
Please find attached a file that has special characters on it. It is a copy and paste from a Micro$oft file.
I don't want to use strings as it remove all the 'indentations' / 'formatting' so I am replacing them with space instead.
I am using the sed command below
sed "s/$(printf... (1 Reply)
Discussion started by: newbie_01
1 Replies
LEARN ABOUT ULTRIX
wipefs
WIPEFS(8) System Administration WIPEFS(8)NAME
wipefs - wipe a signature from a device
SYNOPSIS
wipefs [options] device...
wipefs [--backup] -o offset device...
wipefs [--backup] -a device...
DESCRIPTION
wipefs can erase filesystem, raid or partition-table signatures (magic strings) from the specified device to make the signatures invisible
for libblkid. wipefs does not erase the filesystem itself nor any other data from the device.
When used without any options, wipefs lists all visible filesystems and the offsets of their basic signatures. The default output is sub-
ject to change. So whenever possible, you should avoid using default outputs in your scripts. Always explicitly define expected columns
by using --output columns-list in environments where a stable output is required.
wipefs calls the BLKRRPART ioctl when it has erased a partition-table signature to inform the kernel about the change.
Note that some filesystems and some partition tables store more magic strings on the device (e.g. FAT, ZFS, GPT). The wipefs command
(since v2.31) lists all the offset where a magic strings have been detected.
When option -a is used, all magic strings that are visible for libblkid are erased. In this case the wipefs scans the device again after
each modification (erase) until no magic string is found.
Note that by default wipefs does not erase nested partition tables on non-whole disk devices. For this the option --force is required.
OPTIONS -a, --all
Erase all available signatures. The set of erased signatures can be restricted with the -t option.
-b, --backup
Create a signature backup to the file $HOME/wipefs-<devname>-<offset>.bak. For more details see the EXAMPLES section.
-f, --force
Force erasure, even if the filesystem is mounted. This is required in order to erase a partition-table signature on a block device.
-h, --help
Display help text and exit.
-J, --json
Use JSON output format.
-n, --noheadings
Do not print a header line.
-O, --output list
Specify which output columns to print. Use --help to get a list of all supported columns.
-n, --no-act
Causes everything to be done except for the write() call.
-o, --offset offset
Specify the location (in bytes) of the signature which should be erased from the device. The offset number may include a "0x" pre-
fix; then the number will be interpreted as a hex value. It is possible to specify multiple -o options.
The offset argument may be followed by the multiplicative suffixes KiB (=1024), MiB (=1024*1024), and so on for GiB, TiB, PiB, EiB,
ZiB and YiB (the "iB" is optional, e.g. "K" has the same meaning as "KiB"), or the suffixes KB (=1000), MB (=1000*1000), and so on
for GB, TB, PB, EB, ZB and YB.
-p, --parsable
Print out in parsable instead of printable format. Encode all potentially unsafe characters of a string to the corresponding hex
value prefixed by 'x'.
-q, --quiet
Suppress any messages after a successful signature wipe.
-t, --types list
Limit the set of printed or erased signatures. More than one type may be specified in a comma-separated list. The list or individ-
ual types can be prefixed with 'no' to specify the types on which no action should be taken. For more details see mount(8).
-V, --version
Display version information and exit.
EXAMPLES
wipefs /dev/sda*
Prints information about sda and all partitions on sda.
wipefs --all --backup /dev/sdb
Erases all signatures from the device /dev/sdb and creates a signature backup file ~/wipefs-sdb-<offset>.bak for each signature.
dd if=~/wipefs-sdb-0x00000438.bak of=/dev/sdb seek=$((0x00000438)) bs=1 conv=notrunc
Restores an ext2 signature from the backup file ~/wipefs-sdb-0x00000438.bak.
AUTHOR
Karel Zak <kzak@redhat.com>
ENVIRONMENT
LIBBLKID_DEBUG=all
enables libblkid debug output.
SEE ALSO blkid(8), findfs(8)AVAILABILITY
The wipefs command is part of the util-linux package and is available from https://www.kernel.org/pub/linux/utils/util-linux/.
util-linux December 2014 WIPEFS(8)