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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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diff3(1)						      General Commands Manual							  diff3(1)

Name
       diff3 - 3-way differential file comparison

Syntax
       diff3 [-ex3] file1 file2 file3

Description
       The command compares three versions of a file, and publishes the ranges of text that disagree, flagged with the following codes:

	  ====	      all three files differ

	  ====1       file1 is different

	  ====2       file2 is different

	  ====3       file3 is different

       The type of change needed to convert a given range of a given file to some other is indicated in one of these ways:

	  f : n1 a    Text is to be appended after line number n1 in file f, where f = 1, 2, or 3.

	  f : n1 , n2 c
		      Text is to be changed in the range line n1 to line n2.  If n1 = n2, the range may be abbreviated to n1.

       The original contents of the range follows immediately after a c indication.  When the contents of two files are identical, the contents of
       the lower-numbered file is suppressed.

Options
       -3   Produces an editor script containing the changes between file1 and file2 that are to be incorporated into file3.

       -e	   Produces an editor script containing the changes between file2 and file3 that are to be incorporated into file1.

       -x	   Produces an editor script containing the changes among all three files.

Examples
       Under the -e option, publishes a script for the editor that incorporates into file1 all changes between file2 and  file3  -  that  is,  the
       changes	that would normally be flagged ==== and ====3.	Option -x (-3) produces a script to incorporate only changes flagged ==== (====3).
       The following command applies the resulting script to `file1':
       (cat script; echo '1,$p') | ed - file1

Restrictions
       Text lines that consist of a single `.'	defeat -e.

Files
       /tmp/d3?????
       /usr/lib/diff3

See Also
       cmp(1), comm(1), diff(1), dffmk(1), join(1), sccsdiff(1), uniq(1)

																	  diff3(1)
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