[shell] sed 插入多行文本

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./script <file_path>

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#!/bin/sh

work_path=$(dirname $0) 
cd $work_path
work_path=$(pwd)

if [ $# -ne 1 ]; then
    echo "./script [file_name]"
    exit 1
fi

file_name=$1

insert='i\
if test \"x${ac_cv_env_CFLAGS_set}\" = \"x\"; then : \ 
    CFLAGS=\"-fPIC\" \
fi \
if test \"x${ac_cv_env_CXXFLAGS_set}\" = \"x\"; then : \ 
    CXXFLAGS=\"-fPIC\" \
fi
'

insert_func() {
    if [ $(uname -s) == "Darwin" ]; then
        # mac
        sed -i "" "2,7d" $file_name
        sed -i "" "2$insert" $file_name
    else
        # linux
        sed -i "2,7d" $file_name
        sed -i "2$insert" $file_name
    fi  
}

insert_func