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c | getline pdo?cmd = "realpath -m /proc/"$2"/exe"should becmd = "realpath -m \047/proc/"$2"/exe\047"or the contents of$2will be exposed to the shell for globbing, word splitting, and filename expansion.cmd | getline pathshould beif ( (cmd | getline path) > 0 ) { ...or similar to protect against failures incmd | getline, see awk.freeshell.org/AllAboutGetline.!x[$1]++= an array used in that context is commonly, idiomatically namedseeninstead ofxfor clarity, i.e.!seen[$1]++. Changing a field as in$2 = path" "$2will change all of the white space on the line to individual blank chars which may be undesirable. I know the OP is outputing tocolumn -tbut that will corrupt the output if apathcontains spaces.print $0can be written as justprintsince$0is what is printed by default.