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Top Forums Shell Programming and Scripting sed to remove 1st two characters every line of text file Post 302323827 by jojo123 on Tuesday 9th of June 2009 05:03:40 AM
Old 06-09-2009
Error

Hi all,

I've been through this post and found great.

I really like the logic of mr.cfajohnson.

I have a Query regarding this post with Mr.cfajohnson

Please help me in understanding this.


as you mentioned two commands

one for the case where you are removing the first two digits

Code:
sed 's/^..//' file1.txt > file2.txt

and secondly

Code:
sed -e 's/^..//' -e 's/..$//' file1.txt > file2.txt

to remove the last two lines


Now my query is,that while using the sed command, the [two dots] means removing two digits for either of the command. Please confirm


Also if I want to remove the first three digits would it be like

sed 's/^...//' file1.txt > file2.txt

Please Confirm.


Also as i am new to "sed" Plese do guide regarding

sed 's ===============> what does ('s) means here

Similarly,

sed -e ==============> what does (-e) means here.



Thanks in advance.

Replies from anyone is welcome.Smilie
 

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merge(1)						      General Commands Manual							  merge(1)

NAME
merge - three-way file merge SYNOPSIS
file1 file2 file3 DESCRIPTION
combines two files that are revisions of a single original file. The original file is file2, and the revised files are file1 and file3. identifies all changes that lead from file2 to file3 and from file2 to file1, then deposits the merged text into file1. If the option is used, the result goes to standard output instead of file1. An overlap occurs if both file1 and file3 have changes in the same place. prints how many overlaps occurred, and includes both alterna- tives in the result. The alternatives are delimited as follows: lines in file1 lines in file3 If there are overlaps, edit the result in file1 and delete one of the alternatives. This command is particularly useful for revision control, especially if file1 and file3 are the ends of two branches that have file2 as a common ancestor. EXAMPLES
A typical use for is as follows: 1. To merge an RCS branch into the trunk, first check out the three different versions from RCS (see co(1)) and rename them for their revision numbers: 5.2, 5.11, and 5.2.3.3. File 5.2.3.3 is the end of an RCS branch that split off the trunk at file 5.2. 2. For this example, assume file 5.11 is the latest version on the trunk, and is also a revision of the "original" file, 5.2. Merge the branch into the trunk with the command: 3. File 5.11 now contains all changes made on the branch and the trunk, and has markings in the file to show all overlapping changes. 4. Edit file 5.11 to correct the overlaps, then use the command to check the file back in (see ci(1)). WARNINGS
uses the ed(1) system editor. Therefore, the file size limits of ed(1) apply to AUTHOR
was developed by Walter F. Tichy. SEE ALSO
diff3(1), diff(1), rcsmerge(1), co(1). merge(1)
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