[SOLVED] Looking for a one line alternative

grail · 04-28-2010, 05:25 AM

So I have been enjoying trying to find minimal answer results to questions of late using a variety of sed, awk and bash (and happy for other alternatives).

I have a small piece of code and was wondering if anyone has a good one liner to accomplish the same, the ones i currently have don't seem much better than my current code:

Current Code:

Code:

if [[ $(grep -q "foo" $file) -eq 0 ]]
then
    sed -i 's/foo/bar/' $file
else
    echo "bar" >> $file
fi

As you can see the general scenario is:
1. If "foo" in file change it for "bar"
2. Else add "bar" to the end of the file

To give an idea of what I have tried:

Code:

awk 'BEGIN{f=1}/foo/{gsub(/foo/,"bar");f=0}END{if(f)print "bar"}1' file

Any suggestions greatly appreciated

catkin · 04-28-2010, 05:47 AM

Something along the lines of (not tested but I know you can figure it out from the general idea

)

Code:

[[ grep -q foo "$file" ]] && sed -i 's/foo/bar/' "$file" || echo bar >> "$file"

The quoting changes are meant to be both more minimal and more robust.

EDIT: silly mistake! The [[ ]] adds nothing; here's tidier

Code:

grep -q foo "$file" && sed -i 's/foo/bar/' "$file" || echo bar >> "$file"