Determine the File Count in Unix Directory
May 21, 2008
To determine the number of files in the Unix directory, use the following command.
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ls -l | grep -c "^-.*"
Merging Files in Unix
May 9, 2008
You have multiple files in containing data in similar format and wanted to consolidate in a single file. This is usually the case if you have a daily log that you want to place an archive copy in a single file in weekly or in monthly, yearly.
The basic syntax of merging file is
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cat <source file> >> <target file>
If you have more than 10 files to merge it is better to write a shell script that will loop through the files and merge in a file. The following is the code for merging the files in a folder into a single file.
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#!/bin/sh
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echo enter file name
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read filename
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for arg in `ls;`
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do
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echo $arg
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cat $arg >> $filename
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done
Lines 2 and 3 prompts the user for the filename of the file which will contain the consolidated contents of all the files in the current folder.
Lines 5 to 9 loops through the files in the current folder and merge the files to a single file.
Simplest File Merging
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#!/bin/sh
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echo enter file name
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read source_filemask
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read master_filename
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cat $arg >> $filename
A simple file merging
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cat $<filemask>*> $<filename>
Example
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cat $Test*> $FinalTest.txt
Writing Files in Unix
May 9, 2008
To write files in Unix, the syntax is
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echo <text> > <filename>
Example
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echo "This is my message." > myfile.txt
To add another line in the myfile.txt, use the following syntax.
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echo "This is my second message." >> myfile.txt
You may notice that double greater than sign (>>) is used instead of single greater than sign. This means that the message is written in append mode.
Let's open the myfile.txt by using the following command.
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tail myfile.txt
The content of the myfile.txt should have the following.
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This is my message.
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This is my second message.
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