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Top Forums Shell Programming and Scripting sed help,to replace the last character Post 302444046 by cola on Tuesday 10th of August 2010 08:43:46 PM
Old 08-10-2010
sed help,to replace the last character

cat input.txt
Code:
agsbdafgd
ertebrtreter
ahrbrwerg

The last character of a line that does not start with a would be changed to Z.
Final output:
Code:
agsbdafgd
ertebrtreteZ
ahrbrwerg

Can anyone post the sed command to do that?
 

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compact(1)						      General Commands Manual							compact(1)

Name
       compact, uncompact, ccat - compress and uncompress files, and cat them

Syntax
       compact [name...]
       uncompact [name...]
       ccat [file...]

Description
       The  command compresses the named files using an adaptive Huffman code.	If no file names are given, the standard input is compacted to the
       standard output.  The command operates as an on-line algorithm.	Each time a byte is read, it is encoded immediately according to the  cur-
       rent  prefix  code.   This code is an optimal Huffman code for the set of frequencies seen so far.  It is unnecessary to prepend a decoding
       tree to the compressed file since the encoder and the decoder start in the same state and stay synchronized.  Furthermore, and can  operate
       as filters.  In particular,
	    ... | compact | uncompact | ...
       operates as a (very slow) no-op.

       When  an  argument file is given, it is compacted and the resulting file is placed in file.C; file is unlinked.	The first two bytes of the
       compacted file code the fact that the file is compacted.  This code is used to prohibit recompaction.

       The amount of compression to be expected depends on the type of file being compressed.  Typical values of compression are: Text (38%), Pas-
       cal Source (43%), C Source (36%) and Binary (19%).  These values are the percentages of file bytes reduced.

       The command restores the original file from a file compressed by If no file names are given, the standard input is uncompacted to the stan-
       dard output.

       The command cats the original file from a file compressed by without uncompressing the file.

       The command is present only for compatibility.  In general, the command runs faster and gives better compression.

Restrictions
       The last segment of the file name must contain fewer than thirteen characters to allow space for the appended '.C'.

Files
       compacted file created by compact, removed by uncompact

See Also
       compress(1)

																	compact(1)
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