asked on

read a file via sed , awk or perl

how to do the following from command line:
read a file start file is like that
scan id 123
difference
only 2 line then check if the second line is difference then variable scan in second file is 123

if start file like
scan id 123
no difference do nothing.

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MURUGESAN N

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MURUGESAN N

Similar and updated command:

for InputFiles in InputFile_29006828.txt Input_SecondFile.txt Input_ThirdFile.txt
do
        ValidateFirstSecondLine=''`/bin/awk '{
                arr[NR]=$0;
                LastLineNum=NR
        }
        END {
                if ( arr[1] != arr[2])
                {
                        if ( 1 >= LastLineNum)
                        {
                                printf( "File %s having only %d line\n", FILENAME, LastLineNum);
                        }
                        else
                        {
                                printf( "First line and second line varies in %s\n", FILENAME);
                        }
                }
        }'   "$InputFiles" | /usr/bin/tr -d "\n"`''
        if test "" != "$ValidateFirstSecondLine"
        then
                echo "$ValidateFirstSecondLine"
                echo Press Enter
                read
        fi
done

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Output:

First line and second line varies in InputFile_29006828.txt
Press Enter

File Input_SecondFile.txt having only 1 line
Press Enter

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MURUGESAN N

1. Provided related and tested answer
2. Question being inactive.