Need to replace one string, in a file, with another string from a different file ...

For the following code:

awk -F":" -v OFS=":" 'NR==FNR{a[$1]=$2;next}a[$1]{$2=a[$1]}1'  shadow2 shadow1 > shadow3 

I get syntex error (random one ) as below:

awk: NR==FNR{a[]=;next}a[]{=a[]}1
awk:           ^ syntax error
awk: fatal: invalid subscript expression

What might be the potential cause?

---------- Post updated 09-15-09 at 12:28 AM ---------- Previous update was 09-14-09 at 11:40 PM ----------

I just noticed that when I create a bash script using the HERE-TAG(from within another bash script) ; in the following manner:

#!/usr/bin/env bash
# Bash_script001.sh

   echo " Inside Bash_script001.sh";
   ...
   ...
   ...

cat>>"Bash_script002.sh"<<EOF
#!/usr/bin/env bash
# Bash_script002.sh

   echo " Inside Bash_script002.sh";
   ...

   awk -F":" -v OFS=":" 'NR==FNR{a[$1]=$2;next}a[$1]{$2=a[$1]}1' shadow2 shadow1 > shadow3;
   ...

   ...

EOF

   ....
   echo " Again inside Bash_script001.sh processing rest of Bash_script001.sh ";

Now when the 'Bash_script002.sh' gets created and as it contains the awk script which inturns contains variables $1, $2 as array a[] indexes; the resultant 'Bash_script002.sh' contains only the following:

awk -F":" -v OFS=":" 'NR==FNR{a[]=;next}a[]{=a[]}1' shadow2 shadow1 > shadow3;

Thats why I'm receiving the syntex error.

Will you please suggest, what can be done to avoid getting the above erronious 'awk' statement in the resultant 'Bash_script002.sh' ?

Thanks in advance and my sincere appreciation for the support so far I received in this forum from all.

hi Praveen for the time being declare a variable
#!/usr/bin/env bash
# Bash_script001.sh

echo " Inside Bash_script001.sh";
s="$"
...
...
...

cat>>"Bash_script002.sh"<<EOF
#!/usr/bin/env bash
# Bash_script002.sh

echo " Inside Bash_script002.sh";
...

awk -F":" -v OFS=":" 'NR==FNR{a[${s}1]=${s}2;next}a[${s}1]{${s}2=a[${s}1]}1' shadow2 shadow1 > shadow3;
...

...

EOF

....
echo " Again inside Bash_script001.sh processing rest of Bash_script001.sh ";

for the time being u can use this...this would work fine hopefully....

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I thought "we" had already fixed it here?

that was good reply vgersh...i never knew this...thanks...

Hey Fellas.

I am new to scripting. After searching the forums, this is about the closest to what i'm looking for. I am trying to find a particular sting in a file and replace the next line, roughly about 1500 times in the file. I have been trying to do this with sed, but i haven't had the best of luck. The string that i need to replace with is in another file in csv format. example:
first found instance in file1 is replaced with line 1 in csv file
second found instance in file1 is replaced with line 2 in csv file and so on.
When i say i'm brand new to scripting i mean BRAND new. I'm taking some classes, but i need to get this done as soon as possible and what i have learned so far hasn't gotten me much closer. any help ya'll can give would be greatly appreciated.
Thanks!