如何在具有标题行的文件上使用Unix排序命令？

Question

如何通过排序省略csv文件中的标题行？

到目前为止我有这个:

sort -o  ./trans.csv -k 1,1n ./trans.csv

除了标题行之外,它也能很好地排序.

Answer 1

要在输出中保留标题,并对所有非标题行进行排序:

# create a temporary file to store output to
infile="trans.csv"
tempfile=$(mktemp "${infile}.XXXXXX")

if {
  IFS= read -r header            # read header from input to variable
  printf '%s\n' "$header"        # write header from variable to output
  sort -k 1,1n                   # pass all other input to output through sort
} <"$infile" >"$tempfile"; then  # if sort reports success (exit status 0)
  mv -- "$tempfile" "$infile"    # ...then atomically rename over input
else                             # if sort fails...
  echo "ERROR: Output file and input file have different line counts" >&2
  rm -f "$tempfile"              # then delete the temporary file.
  false                          # and ensure that $? reflects a failure
fi

请注意,该if块仅检查退出状态sort,理论上我们更关心数​​据是否通过而不是标头.&&如果不是首选,请考虑使用s而不是换行来附加块中的项目.