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Top Forums UNIX for Dummies Questions & Answers a strange message when executing the sort command Post 302115500 by zazzybob on Wednesday 25th of April 2007 07:07:40 AM
Old 04-25-2007
It's doing exactly what it says - it's adding a newline to the end of your input file as one isn't there, e.g.
Code:
$ echo -n "foo" | sort
sort: warning: missing NEWLINE added at EOF
foo
$ echo "foo" | sort
foo

You can suppress this benign message by redirecting STDERR to /dev/null, or by appending a newline to your input file, e.g.:
Code:
$ ( gzip -dc ./file.gz; echo ) | sort
-or-
$ gzip -dc ./file.gz | sort 2>/dev/null

You can verify that the last line of your input file doesn't contain a newline with:
Code:
$ gzip -dc ./file.gz | tail -1 | od -c

Cheers,
ZB
 

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SORT(1) 						      General Commands Manual							   SORT(1)

NAME
sort - sort a file of ASCII lines SYNOPSIS
sort [-bcdfimnru] [-tc] [-o name] [+pos1] [-pos2] file ... OPTIONS
-b Skip leading blanks when making comparisons -c Check to see if a file is sorted -d Dictionary order: ignore punctuation -f Fold upper case onto lower case -i Ignore nonASCII characters -m Merge presorted files -n Numeric sort order -o Next argument is output file -r Reverse the sort order -t Following character is field separator -u Unique mode (delete duplicate lines) EXAMPLES
sort -nr file # Sort keys numerically, reversed sort +2 -4 file # Sort using fields 2 and 3 as key sort +2 -t: -o out # Field separator is : sort +.3 -.6 # Characters 3 through 5 form the key DESCRIPTION
Sort sorts one or more files. If no files are specified, stdin is sorted. Output is written on standard output, unless -o is specified. The options +pos1 -pos2 use only fields pos1 up to but not including pos2 as the sort key, where a field is a string of characters delim- ited by spaces and tabs, unless a different field delimiter is specified with -t. Both pos1 and pos2 have the form m.n where m tells the number of fields and n tells the number of characters. Either m or n may be omitted. SEE ALSO
comm(1), grep(1), uniq(1). SORT(1)
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