Sed replace value with variable

List of articles

sed

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Preface

Replace value with variable

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One 、sed

sed -i 's/old/new/g' file

Two 、 Replace value with variable

1. Replacement value

# echo "123" | sed 's/2/4/g'
143

2. Variable

# export num=55
# echo "123" | sed 's/2/'$num'/g'
1553

# hostname=`hostname`;echo '"Groups": null' | sed 's/null/["'$hostname'"]/g'
"Groups": ["tencent"]

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Reference resources

1. sed Reference environment variables in
2. sed The replacement value in the command is shell Variable