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--- linux:sed [2018/09/26 17:41] – created percy
+++ linux:sed [2018/10/22 11:31] (current) – percy
@@ Line 15: / Line 15: @@
   gsed ":d;N;s/\n/,/g;bd"
+==== delete the redundant empty lines ====
+Refer
+  - http://kodango.com/sed-and-awk-notes-part-5
+  sed '/^$/{N;/^\n$/D}'
+E.g. Remove all the redundant empty lines in the Java source code
+  find app/src/ -iname "*.java" -exec gsed -i '/^$/{N;/^\n$/D}' {} +
+==== Combine every 3 lines into one line ====
+  sed 'N;N;s/\n/ /g'
+==== Calculate the number ====
+  cat crashlist_googleplay_20181012.txt|grep -v "^$"|grep -A 2 "^in"|grep -v "-"|gsed "N;N;s/\n/ /g"|awk '{sum += $4 } END { print sum }'