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Top Forums Shell Programming and Scripting What does this do (newbie question)... Post 302601496 by methyl on Thursday 23rd of February 2012 08:10:35 PM
Old 02-23-2012
@elohssa
Quote:
ls *.txt | grep text1 | cat file1 – file2 | `echo wc –l`
This code does nothing useful and gives syntax errors.


Code:
ls *.txt | grep Text | cat - file1 file2 | wc -l
ls *.txt | grep Text | cat file1 - file2 | wc -l

Both of these are very dubious code. They both count the number of lines in file1 and file2 and then add the number of filenames which contain the string "Text". The number of lines in the files whose names contain the word "Text" is ignored.

It always helps to post what Operating System and version you are using and what Shell you prefer. It also helps to explain what you expect from the script.


Ps: A variant which totals the number of lines in a file whose name contains the string "Text" added to the number of lines in file1 and file2 would be:
Code:
cat file1 file2 `ls *Text*` | wc -l


Last edited by methyl; 02-23-2012 at 09:15 PM..
 

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diff3(1)						      General Commands Manual							  diff3(1)

NAME
diff3 - 3-way differential file comparison SYNOPSIS
file1 file2 file3 DESCRIPTION
compares three versions of a file, and prints disagreeing ranges of text flagged with these codes: all three files differ file1 is different file2 is different file3 is different The type of change required to convert a given range of a given file to some other is indicated in one of these ways: Text is to be appended after line number n1 in file f, where f = or Text is to be changed in the range line n1 through line n2. If n1 = n2, the range can be abbreviated to n1. The original contents of the range follows immediately after a indication. When the contents of two files are identical, the contents of the lower-numbered file is suppressed. Produces a script for the editor that can be used to incorporate into file1 all changes between file2 and file3 (see ed(1)); i.e., the changes that normally would be flagged and Produces a script to incorporate only changes flagged Produces a script to incorporate only changes flagged Produces a script that will incorporate all changes between file2 and file3, but treat overlapping changes (that is, changes that would be flagged with in normal listing) differently. The overlapping lines in both files will be inserted by the edit script bracketed by and lines. Produces a script that will incorporate only changes flagged , but treat these changes in the manner of option. The following command applies the resulting script to file1. EXTERNAL INFLUENCES
International Code Set Support Single- and multi-byte character code sets are supported. WARNINGS
Text lines that consist of a single period defeat Files longer than 64K bytes do not work. FILES
SEE ALSO
diff(1). diff3(1)
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