disabling the system() function, input redirection with getline , output redirection with print and printf ... error occurs either doing a redirection for getline , during a read f…disabling the system() function, input redirection with getline , output redirection with print and printf ... error occurs either doing a redirection for getline , during a read f…disabling the system() function, input redirection with getline , output redirection with print and printf ... error occurs either doing a redirection for getline , during a read f…passed to functions. The input function getline has the following variations. getline reads into ... updates the fields, NF , NR and FNR . getline < file reads into $0 from file , …