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  1. #!/bin/bash
  2.  
  3.  
  4. echo "host1,app1
  5. host1,app2
  6. host1,app3
  7. host2,app4
  8. host2,app5
  9. host2,app6
  10. host3,app1" | awk -F, 'NR == 1 { currentHost=$1; currentApps=$2 } 
  11.          NR > 1 && currentHost == $1 { currentApps=currentApps "," $2 }
  12.          NR > 1 && currentHost != $1 { print currentHost ";" currentApps; currentHost=$1; currentApps=$2 }
  13.          END { print currentHost ";" currentApps }'
Success #stdin #stdout 0s 4384KB
comments (?)
stdin 
Standard input is empty
stdout 
host1;app1,app2,app3
host2;app4,app5,app6
host3;app1
https://ideone.com/WXlyqS
language:
Bash (bash 5.0.3)
created:
5 years ago
visibility:
public

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