如何在復雜的線條上非常精確地匹配

我們有以下文件：

more test.txt

export KAFKA_HEAP_OPTS="-Xmx8g -Xms8g"
export KAFKA_JVM_PERFORMANCE_OPTS="-XX:MetaspaceSize=96m -XX:+UseG1GC -XX:MaxGCPauseMillis=20 -XX:InitiatingHeapOccupancyPercent=35 -XX:G1HeapRegionSize=16M -XX:MinMetaspaceFreeRatio=50 -XX
:MaxMetaspaceFreeRatio=80"

如何驗證線路：

export KAFKA_HEAP_OPTS="-Xmx8g -Xms8g"

和

export KAFKA_JVM_PERFORMANCE_OPTS="-XX:MetaspaceSize=96m -XX:+UseG1GC -XX:MaxGCPauseMillis=20 -XX:InitiatingHeapOccupancyPercent=35 -XX:G1HeapRegionSize=16M -XX:MinMetaspaceFreeRatio=50 -XX
   :MaxMetaspaceFreeRatio=80"

存在於文件中 - test.txt

當然，我們可以

grep -q 'export KAFKA_HEAP_OPTS="-Xmx8g -Xms8g"' test.txt 
[[ $? -eq 0 ]] && echo "line in file"


grep -q 'export KAFKA_HEAP_OPTS="export KAFKA_JVM_PERFORMANCE_OPTS="-XX:MetaspaceSize=96m -XX:+UseG1GC -XX:MaxGCPauseMillis=20 -XX:InitiatingHeapOccupancyPercent=35 -XX:G1HeapRegionSize=16M -XX:MinMetaspaceFreeRatio=50 -XX
       :MaxMetaspaceFreeRatio=80"' test.txt 
[[ $? -eq 0 ]] && echo "line in file"

但是這種方法很笨拙

#! /bin/bash

env - bash -c '. test.txt; [ -n "$KAFKA_HEAP_OPTS" ] && [ -n "$KAFKA_JVM_PERFORMANCE_OPTS" ]'
if [ $? -eq 0 ]; then
    echo 'OK'
else
   echo 'ERROR'
fi

引用自：https://unix.stackexchange.com/questions/448930