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Script to replace lines in ksh Script

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# 1  
Old 03-30-2015
Script to replace lines in ksh Script
Hi All,

I am novice to Unix and I need your expert advice for the below task.

There is a KSH script file in which I need to replace few line as per the below expectations. So my file look like as

Code:
# Host Setup Command:
Line 1
Line 2
Line 3
Line 4
Line Any
_AB_Proxy_DIR=Out_ABC_For_Bussiness.xml-$$

So in between of # Host Setup Command: and _AB_Proxy_DIR=Out_ABC_For_Bussiness.xml-$$ there can be N number of lines and I need to replace those lines as per below format

Code:
# Host Setup Command:
Syntax 1
Syntax 2
Syntax 3
_AB_Proxy_DIR=Out_ABC_For_Bussiness.xml-$$

Please let me know if you experts can help me here.

Thanks in Advance.

Rupali
Last edited by Don Cragun; 03-30-2015 at 02:52 PM.. Reason: Add CODE and ICODE tags.
# 2  
Old 03-30-2015
Is this homework/classwork?
# 3  
Old 03-30-2015
This is the solution I need to implement in Production at one shot.

not sure about the class/home work.
# 4  
Old 03-30-2015
How is Syntax 1 etc. supplied? In a file? Calculated? A constant pattern?
# 5  
Old 03-31-2015
Syntax 1 is a simple text I need to replace with the particular line.
# 6  
Old 03-31-2015
Try:
Code:
sed s,"Syntax 1","Particular Line",g "$WORKFILE"

When it looks as you want it to, add -i before the workfile.

hth
# 7  
Old 03-31-2015
The following works with without external programs like sed.
It deletes the block between start marker and end marker, and where it's at the end marker puts a replacement text.
Each iteration of the while loop reads a line from "./file" into the variable $line.
The variable $block is non-null if inside the block.
The output in the while loop is redirected to a new file, that is finally copied back to "./file".
Code:
block=""
f="./file"
while IFS= read -r line
do
  if [ -n "$block" ] && [ "$line" = '_AB_Proxy_DIR=Out_ABC_For_Bussiness.xml-$$' ]
  then
    block=""
    printf "%s" "\
Syntax 1
Syntax 2
Syntax 3
"
  fi
  if [ -z "$block" ]
  then
    printf "%s\n" "$line"
    [ "$line" = '# Host Setup Command:' ] && block=1
  fi
done < "$f" > "$f.new"
[ -s "$f.new" ] &&
cp "$f.new" "$f" &&
rm "$f.new"

Last edited by MadeInGermany; 03-31-2015 at 05:39 AM..
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