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Shell Programming and Scripting

adding text to a file

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# 1  
Old 10-23-2009
adding text to a file
Hi All

I am making a script in which.I have a problem i try to discribe.

Code:
File1 content need to be append in file 2 but such as if content already exist then dont add.

File1 IS Like this

myname
yourname
hername
hisname

File2 

%AddNameHere  myname yourname hername hisname

# 2  
Old 10-23-2009
Is this what you looking for ?
The file2 layout that you show does not reflect what you stated as "append" the name to the file, but I'm assuming append (meaning at the end of the file). I'm also assuming that each name is on a separate line in file2. Considering those assumptions, here is what I came up with for an example in bash:

Code:
#!/bin/bash

#
#       check arguments
#
if (( $# != 2 ))
then
        echo ""
        echo $0 : Invalid number of arguments $#
        echo ""
        exit 1
fi

#
#       declare variables (easier read)
#
declare file1=$1
declare file2=$2

#
#       read each line in file1, check if it exists in
#       file2, and if not, then append it.
#
cat $file1 | \
while read name
do
        egrep -s $name $file2
        if (( $? != 0 ))
        then
                echo $name >> $file2
                echo "added name "$name
        fi
done

let me know if this does it, or if my assumptions are wrong.
# 3  
Old 10-23-2009
Quote:
Originally Posted by sdanner
The file2 layout that you show does not reflect what you stated as "append" the name to the file, but I'm assuming append (meaning at the end of the file). I'm also assuming that each name is on a separate line in file2. Considering those assumptions, here is what I came up with for an example in bash:

Code:
#!/bin/bash

#
#       check arguments
#
if (( $# != 2 ))


Non-standard. Use:

Code:
if [ $# -ne 2 ]

Quote:
Code:
then
        echo ""
        echo $0 : Invalid number of arguments $#
        echo ""
        exit 1
fi

#
#       declare variables (easier read)
#
declare file1=$1
declare file2=$2


declare is non-standard and unnecessary.
Quote:
Code:
#
#       read each line in file1, check if it exists in
#       file2, and if not, then append it.
#
cat $file1 | \


UUOC and the backslash is unnecessary.
Quote:
Code:
while read name
do
        egrep -s $name $file2
        if (( $? != 0 ))


See above.
Quote:
Code:
        then
                echo $name >> $file2
                echo "added name "$name
        fi
done

let me know if this does it, or if my assumptions are wrong.
# 4  
Old 10-23-2009
corrected script, corrections made per C. Johnson
To: cfajohnson... thanks for taking the time to fix this up. I'll try and keep your advice in mind next time. ( Guess I should get your book, huh? :>D )

To: aliahsan81... just for completeness, here is the same script with cfajohnson suggestions.

Code:
#!/bin/bash

#
#       check arguments
#
if [ $# -ne 2 ]
then
        echo ""
        echo $0 : Invalid number of arguments $#
        echo ""
        exit 1
fi

#
#       declare variables (easier read)
#
file1=$1
file2=$2

#
#       read each line in file1, check if it exists in
#       file2, and if not, then append it.
#
while read name
do
        egrep -s $name $file2
        if [ $? != 0 ]
        then
                echo $name >> $file2
                echo "added name "$name
        fi
done < $file1

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