Using bash and sed to Modify a Text File
This shell script demonstrates how to write to a text file, and then modify the contents. #!/bin/sh # modfile.sh # by ScottM, 04/12/2007 # demonstrates writing text to a file, and then using sed to modify it. TESTFILE=test.txt FRUIT=banana # add some content to the file (note: file will be overwritten) echo "apple" > $TESTFILE # modify the content sed -e "s/apple/& $FRUIT/g" -i $TESTFILE # sed uses the "s" option, which uses regular expressions to search and replace text # "s/apple/" means search for any lines that contain the characters "apple" # "& " means use the results of whatever was found # "/& $FRUIT/g" -- replace "apple" with "apple banana", # the g is for global, or all lines containing the pattern # output: # $ cat test.txt # apple banana # $ Sed One Liner This is really only a one line script, commonly referred to as a on-liner, so we don't really need a...