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Insert content before a specific line (file.insert_line)

Declaration​

ok, err = file.insert_line(path, n, content)

Parameters​

  • path
    String. Absolute file path.
  • n
    Integer. Line number. 0 means last line + 1. Negative means counting from the end.
  • content
    String. Data to insert before the specified line.

Returns​

  • ok
    Boolean. true if success, false if failure.
  • err
    String. Error message when operation fails.

Notes​

Insert content before the specified line. If the number of lines is not enough, empty lines will be filled. Creates file if it does not exist. Returns false if directory does not exist.
This function automatically strips UTF-8 BOM at the file head.

Example​

local success, err = file.insert_line("/var/mobile/1.txt", 2, "岂因祸福避趋之")
if success then
    sys.alert("Success")
else
    sys.alert("Failed: "..err)
end

Note: Uses sys.alert