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Shell Programming and Scripting

Search & Replace

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# 8  
Old 06-14-2012
@fretagi

sed command structure when using a file is:

Code:
sed 's/<SEARCH>/<REPLACE>/' <FILENAME>

You have the first part correct just add the filename at the end (without <).

Helpful info can be seen by running:
Code:
man sed

# 9  
Old 06-14-2012
Hi

this is the contents of the script:
Code:
#!/bin/sh
string1="encoding=\"\""
string2="encoding=\"UTF-8\""
sed 's/$string1/$string2/g' text2insert.txt

this is the text file that needs to be modified:

Code:
#more text2insert.txt
<?xml version='1.0' encoding=""?>
<AddressPage xml:lang="PT">

and I am running as this:

Code:
sh sandr.sh

but no luck
# 10  
Old 06-14-2012
oops my bad... replace the single quotes in sed with double quotes when using shell variables in search or replace fields:

Code:
#!/bin/sh
string1="encoding=\"\""
string2="encoding=\"UTF-8\""
sed "s/$string1/$string2/g" text2insert.txt

Result:
Code:
#more text2insert.txt
<?xml version='1.0' encoding="UTF-8"?>
<AddressPage xml:lang="PT">

# 11  
Old 06-14-2012
it does print on the console the wanted results, but does not change the actual file
# 12  
Old 06-14-2012
Check Birei's solution using perl -i or check if your sed supports -i.
# 13  
Old 06-14-2012
it does work when I changed the script to:

Code:
#!/bin/sh
string1="encoding=\"\""
string2="encoding=\"UTF-8\""
sed "s/$string1/$string2/g" text2insert.txt > text2.out

but the filename cannot be changed, and is to be used on several files
# 14  
Old 06-14-2012
use the "-i" flag for sed when you get the search and replace correct. When using the "-i" flag do not use the "> text2.out" at the end.

That flag is to change the file "in place" so you do not have to output to another file.

If you ommit the "> text2.out" and do not use the "-i" flag sed will print the changed file to screen so that you can see it.
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