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Full Discussion: Uniq and sort -u
Top Forums UNIX for Dummies Questions & Answers Uniq and sort -u Post 302927647 by senhia83 on Thursday 4th of December 2014 09:47:28 AM
Old 12-04-2014
Uniq and sort -u

Hello all,

Need to pick your brains,

I have a 10Gb file where each row is a name, I am expecting about 50 names in total. So there are a lot of repetitions in clusters.

So I want to do a

Code:
sort -u file

Will it be considerably faster or slower to use a uniq before piping it to sort -u ? Does consolidating all the neighbors first help in this case?

Code:
cat file | uniq | sort -u

My file looks like

Code:
name1
name1
name1
name2
name2
name2
name1
....

name50

 

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QUOT(8) 						      System Manager's Manual							   QUOT(8)

NAME
quot - summarize filesystem ownership SYNOPSIS
quot [ -acfguvi ] [ filesystem... ] DESCRIPTION
quot displays the number of kilobytes in the named filesystem currently owned by each user or group. Note that this utility currently works only for XFS. OPTIONS
-a Generate a report for all mounted filesystems giving the number of kilobytes used by each user or group. -c Display three columns giving file size in kilobytes, number of files of that size, and cumulative total of kilobytes in that size or smaller file. The last row is used as an overflow bucket and is the total of all files greater than 500 kilobytes. -f Display count of kilobytes and number of files owned by each user or group. -g Report on groups. -u Report on users (the default). -v Display three columns containing the number of kilobytes not accessed in the last 30, 60, and 90 days. -i Ignore mountpoints mounted by automounter. -T Avoid truncation of user names longer than 8 characters. -q Do not sort the output. FILES
/etc/mtab mounted filesystem table /etc/passwd default set of users /etc/group default set of groups SEE ALSO
du(1), ls(1). BUGS
Currently, only the XFS filesystem type is supported. QUOT(8)
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