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sed replace with variable Code Example
replace text with sed 
sed -i 's/old-text/new-text/g' input.txt
sed replace in file 
sed -i 's/foo/bar/g' hello.txt
Source: www.cyberciti.biz
sed replace with variable 
Just concatenate var '"$var"' to replace values string in sed command:
$ sed -i 's/string_to_replace/'"$var"'/g' file_to_replace.txt
replace using sed 
#on my mac
sed -i -e 's/old-text/new-text/g' text.txt
sed replace with variable 
sed -i "s/$var1/ZZ/g" "$file"
Source: askubuntu.com
sed replace with variable 
For using match in sed replacement, just border it with '\(' and '\)':
echo Before123 | sed 's/Before\([0-9]*\)/\1After/g'
123After	# number is matched withtin '\( \)' and replaced in '\1'
Example with 2 match replacements
echo a_b | sed 's/\(^.*\)_\(.*$\)/first is \1 and \2 is after/g'



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Type:
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Category:
 Coding
Sub Category:
 Code Example
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Horje