For trivial file size the main overhead is loading programs and opening the file. Reading the file directly with "cut" makes sense.
For large files the argument is less clear unless the command is better than "cat" at reading data from disc.
For example with a 600 Mb text file:
Code:
timex cat bigfile|cut -f2 -d- >/dev/null
real 17.60
user 0.17
sys 2.62
timex cut -f2 -d- bigfile >/dev/null
real 17.45
user 16.10
sys 1.32
Here reading the file direcly in "cut" is fractionally quicker but has a greater impact on the system overall.
how do you show just the used disk space. using the cut and df command?? or does anyone have any other suggestions on how to do it a better way? (3 Replies)
Hi,
I want to cut from a particular position to a particular position and retain the rest.
I tried this
cut -c31-51 file1.txt > file2.txt
But The characters from the position 31 to 51 were only present in file2.txt.
Is there a way to reverse this i.e to retain the rest except from... (1 Reply)
Gurus,
I need help with the cut command :
I have a file with garbage charaters at the beginning of each record; but these characters are not of the same length;
First record has 3 garbage chars to be removed; rest have 2;
If the length was consistent across all the records, I could have... (3 Replies)
Hi
Can anyone what I am doing wrong while using cut command.
for f in *.log
do
logfilename=$f
Log "Log file Name: $logfilename"
logfile1=`basename $logfilename .log`
flength=${#logfile1}
Log "file length $flength"
from_length=$(($flength - 15))
Log "from... (2 Replies)
hay
i am trying to get JUST the PID from the ps command.
my command line is:
ps -ef | grep "mintty" | cut -d' ' -f2
but i get an empty line. i assume that the delimiter is not just one space character, but can't figure out what should i do in order to do that.
i know i can use awk or cut... (8 Replies)
hi,
i have a file
abc,"an,ab",cde,efg
abc,anab,cde,efg and need to cut the second field so the output should be abc,cde,efg and i have used cut -d',' -f1-1,3- but its giving me
abc,ab",cde,efg
abc,cde,efg (4 Replies)
I'm a complete beginner in UNIX (and not a computer science student either), just undergoing a tutoring course. Trying to replicate the instructions on my own I directed output of the ls listing command (lists all files of my home directory ) to My_dir.tsv file (see the screenshot) to make use of... (9 Replies)
im currently running the following command to grab all arguments in front of a script, directly from the process table.
# cat /tmp/allmyprocs
ubuntu 9933 27793 0 03:29 pts/0 00:00:00 /bin/sh ./prying.sh
ubuntu 9941 9933 0 03:29 pts/0 00:00:00 sh
ubuntu 9952 9941 0 03:29... (1 Reply)
Discussion started by: SkySmart
1 Replies
LEARN ABOUT NETBSD
cut
CUT(1) BSD General Commands Manual CUT(1)NAME
cut -- select portions of each line of a file
SYNOPSIS
cut -b list [-n] [file ...]
cut -c list [file ...]
cut -f list [-d delim] [-s] [file ...]
DESCRIPTION
The cut utility selects portions of each line (as specified by list) from each file and writes them to the standard output. If the file
argument is a single dash ('-') or no file arguments were specified, lines are read from the standard input. The items specified by list can
be in terms of column position or in terms of fields delimited by a special character. Column numbering starts from 1.
list is a comma or whitespace separated set of increasing numbers and/or number ranges. Number ranges consist of a number, a dash (-), and a
second number and select the fields or columns from the first number to the second, inclusive. Numbers or number ranges may be preceded by a
dash, which selects all fields or columns from 1 to the first number. Numbers or number ranges may be followed by a dash, which selects all
fields or columns from the last number to the end of the line. Numbers and number ranges may be repeated, overlapping, and in any order. It
is not an error to select fields or columns not present in the input line.
The options are as follows:
-b list The list specifies byte positions.
-c list The list specifies character positions.
-d string Use the first character of string as the field delimiter character. The default is the <TAB> character.
-f list The list specifies fields, separated by the field delimiter character. The selected fields are output, separated by the field
delimiter character.
-n Do not split multi-byte characters.
-s Suppresses lines with no field delimiter characters. Unless specified, lines with no delimiters are passed through unmodified.
EXIT STATUS
cut exits 0 on success, 1 if an error occurred.
SEE ALSO paste(1)STANDARDS
The cut utility conforms to IEEE Std 1003.2-1992 (``POSIX.2'').
BSD December 21, 2008 BSD