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Top Forums UNIX for Beginners Questions & Answers Replace string2 with string3 on all lines starting with string1 Post 303019120 by supernono06 on Saturday 23rd of June 2018 01:26:10 PM
Old 06-23-2018
Replace string2 with string3 on all lines starting with string1

My OS is Windows 10 and I am using Cygwin.

The file 1 content is:

USE solution 2; -4.000
USE solution 3; -4.000

USE solution 29; -4.000
USE solution 30; -4.000
USE solution 31; -4.000
….
USE solution 89; -4.000
...
USE solution 202; -4.000
etc...

I need to replace string2(-4.000) with string3(-2.000) on all lines starting with string1(USE solution 2, USE solution 3, …USE solution 29) but the other lines don't have to be changed.

I wrote the following script which does it, but only for the first line:

Code:
sed '/^USE solution 2/ { s,-4.000,-2.000, }' file1.txt > file2.txt

I am looking for a way to use this sed function in a loop where I could say:

If USE solution i (i=2 to 29), then do the replacement.

Being a newbie, I don't have experience at all with loops, sorry for that.

Thanks in advance.

Last edited by supernono06; 06-23-2018 at 03:59 PM..
 

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CFDISK(8)							 GNU cfdisk Manual							 CFDISK(8)

NAME
GNU cfdisk - a curses-based partition table manipulation program SYNOPSIS
cfdisk [options] [device] DESCRIPTION
cfdisk is a disk partition manipulation program, which allows you to create, destroy, resize, move and copy partitions on a hard drive using a simple menu-driven interface. It is useful for organising the disk space on a new drive, reorganising an old drive, creating space for new operating systems, and copying data to new hard disks. For a list of the supported partition types, see the --list-partition-types option below. OPTIONS
-h, --help displays a help message. -v, --version displays the program's version. -a, --arrow-cursor use an arrow cursor, instead of reverse video highlighting, in case your terminal doesn't support it. -z, --new-table create a new partition table on the disk. This is useful if you want to change the partition table type or want to repartition you entire drive. Note that this does not delete the old table on the disk until you commit the changes. -u, --units=UNIT sets the default display units to UNIT. A list of possible units is given below. -t, --list-partition-types displays a list of supported partition types and features. UNITS
You can choose in what unit cfdisk should display quantities like partition sizes. You can choose from sectors, percents, bytes, kilobytes, etc. Note that one kilobyte is equal to 1,000 bytes, as this is consistent with the SI prefixes and is used by hard disk manufacturers. If you prefer to see the sizes in units with binary prefixes, you should instead select one kilo binary byte (kibibyte), which is equal to 1,024 bytes. Whatever display unit you have chosen, you can always enter the quantities in the unit of your choice, for example 1000000B or 1000kB. compact display each size in the most suitable unit from B, kB, MB, GB and TB. B one byte kB one kilobyte (1,000 bytes) MB one megabyte (1,000,000 bytes) GB one gigabyte (1,000,000,000 bytes) TB one terabyte (1,000,000,000,000 bytes) KiB one kilo binary byte (1,024 bytes) MiB one mega binary byte (1,048,576 bytes) GiB one giga binary byte (1,073,741,824 bytes) TiB one tera binary byte (1,099,511,627,776 bytes) s one sector. It depends on the sector size of the disk. You can use it if you want to see or choose the exact size in sectors. % one percent from the size of the disk cyl one cylinder. It depends on the cylinder size. chs use CHS display units. BUGS
There are no known bugs. We are in early stages for development, so be careful. SEE ALSO
fdisk(8), mkfs(8), parted(8) The cfdisk program is fully documented in the info(1) format GNU cfdisk User Manual manual. fdisk 16 June, 2006 CFDISK(8)
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