Hands-On Data Science with the Command Line by Jason Morris

Author:Jason Morris
Language: eng
Format: epub
Tags: COM018000 - COMPUTERS / Data Processing, COM089000 - COMPUTERS / Data Visualization, COM062000 - COMPUTERS / Data Modeling and Design
Publisher: Packt Publishing
Published: 2019-01-31T21:44:32+00:00

Text injection of text files

We're going to create a function that can inject text into an existing file. Here's our function:

lineinfile() {

FILE=$1 ; shift

LINE=”^$1$” ; shift

CONTEXT=”$1.*” ; shift

MODE=${1:-add} ; shift

case “${MODE}” in

add)

grep -s “${LINE}” “${FILE}” || sed -i -e “s/\(${CONTEXT}\)/\1\n${LINE}/” “${FILE}”

;;

del)

grep -s “${LINE}” “${FILE}” || sed -i -e “/${LINE}/d” “${FILE}”

;;

esac

}

The intended usage is as follows:

lineinfile <filename> <string> <insert-after-context-string> <add | [del]>

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