No I cannot, sorry.
I've yet to find a language that gives me as much power despite the terseness as Perl. If I understand correcly, awk does not have an inbuilt array sort routine, but I may be mistaken.
The only other non-Perl and non-Ruby method I could think of leverages the shell's multiple-key sort command, the algorithm for which would be something like -
(1) Read a line and form the start-end pairs separated by a delimiter.
(2) Redirect the pairs, one per line, to a temporary file.
(3) Sort the temporary file on the multiple numeric keys.
(4) Read them back and print to stdout.
(5) Repeat (1) through (4) till eof.
tyler_durden
---------- Post updated at 05:15 PM ---------- Previous update was at 04:16 PM ----------
Well ok, here's an implementation of algorithm posted earlier, in a Bash shell script -
I believe it's not good enough if the data is huge. Use of arrays instead of temp files should make it faster. It's definitely slower than the Perl script.
hey,
I have a file that looks smthng like this:
/*--- abcd_0050 ---*/
asdfjk
adsfkja
lkjljgafsd
/*---abcd_0005 ---*/
lkjkljbfkgj
ldfksjgf
dfkgfjb
/*-- abcd_0055--*/
klhfdghd
dflkjgd
jfdg
I would like it to be sorted so that it looks like this:
/*---abcd_0005 ---*/
lkjkljbfkgj (9 Replies)
how can i sort the next list just by look at the numbers (ignore letters)
example:
abc123
dff4f
aaa2aa
bbbb55555bb
output:
aaa2aa
dff4f
abc123
bbbb55555bb (1 Reply)
i have list of files:
Wang De Wong CVPR 09.pdf
Yaacob AFGR 99 Second edition.pdf
Shimon CVPR 01.pdf
Den CCC 97 long one.pdf
Ronald De Bour CSPP 04.pdf
.....
how can i sort this directory so the output will be in the next format:
<year>\t<conference/journal>\t<author list> - t is tab
(its... (1 Reply)
i have list of files:
Wang De Wong CVPR 09.pdf
Yaacob AFGR 99 Second edition.pdf
Shimon CVPR 01.pdf
Den CCC 97 long one.pdf
Ronald De Bour CSPP 04.pdf
.....
how can i sort this directory so the output will be in the next format:
<year>\t<conference/journal>\t<author list> - t is tab
(its... (1 Reply)
Let's say that I have a database that I call part ID. This database has the following grouping:
Dart1=4
Dart2=8
Dart3=12
Fork1=68
Fork2=72
Fork3=64
Bike1=28
Bike2=24
Bike3=20
Car1=44
Car2=40
Car3=36
I want to write a program that would read this database and tell me when the... (19 Replies)
hi everyone, I am kind of new to this forum. I need help in sorting this data out accordingly, I am actually doing a traceroute application and wants my AS path displayed in front of my address like this;
192.168.1.1 AS28513 AS65534 AS5089 AS5089 .... till the last AS number and if possible... (1 Reply)
hi everyone, I am kind of new to this forum. I need help in sorting this data out accordingly, I am actually doing a traceroute application and wants my AS path displayed in front of my address like this;
192.168.1.1 AS28513 AS65534 AS5089 AS5089 .... till the last AS number and if possible... (1 Reply)
Hi, I have posted related topic but as i continue the research I find more need to sort the data.
AS(2607:f278:4101:11:dead:beef:f00f:f), AS786 AS6453 AS7575 AS7922
AS(2607:f2e0:f:1db::16), AS786 AS3257 AS36252
AS786 AS3257 AS36252
AS(2607:f2f8:1700::2), AS786 AS6939 AS25795 ... (6 Replies)
Hi, Please i need help in writing an 'awk' script in sorting the following data;
traceroute6 to 2001:1ba0:2a0:5965:0:30:24:1 (2001:1ba0:2a0:5965:0:30:24:1) from 2001:418:1::62, 64 hops max, 16 byte packets
1 2001:418:1::4 0.342 ms
2 2001:418:1::1 0.630 ms
3 2001:504:16::1b1b 0.393 ms
4... (6 Replies)
Hii guys,
I need to sort my file and remove duplicates before writing to another file. The first line in the file are column names. I dont want this line to be sorted and should always be the first line in the output.
sort -u file.txt > file1.txt. is the command that i am using... (4 Replies)
Discussion started by: just4u_sharath
4 Replies
LEARN ABOUT CENTOS
flock
FLOCK(1) User Commands FLOCK(1)NAME
flock - manage locks from shell scripts
SYNOPSIS
flock [options] <file|directory> <command> [command args]
flock [options] <file|directory> -c <command>
flock [options] <file descriptor number>
DESCRIPTION
This utility manages flock(2) locks from within shell scripts or the command line.
The first and second forms wrap the lock around the executing a command, in a manner similar to su(1) or newgrp(1). It locks a specified
file or directory, which is created (assuming appropriate permissions), if it does not already exist. By default, if the lock cannot be
immediately acquired, flock waits until the lock is available.
The third form uses open file by file descriptor number. See examples how that can be used.
OPTIONS -s, --shared
Obtain a shared lock, sometimes called a read lock.
-x, -e, --exclusive
Obtain an exclusive lock, sometimes called a write lock. This is the default.
-u, --unlock
Drop a lock. This is usually not required, since a lock is automatically dropped when the file is closed. However, it may be
required in special cases, for example if the enclosed command group may have forked a background process which should not be hold-
ing the lock.
-n, --nb, --nonblock
Fail rather than wait if the lock cannot be immediately acquired. See the -E option for the exit code used.
-w, --wait, --timeout seconds
Fail if the lock cannot be acquired within seconds. Decimal fractional values are allowed. See the -E option for the exit code
used.
-o, --close
Close the file descriptor on which the lock is held before executing command . This is useful if command spawns a child process
which should not be holding the lock.
-E, --conflict-exit-code number
The exit code used when the -n option is in use, and the conflicting lock exists, or the -w option is in use, and the timeout is
reached. The default value is 1.
-c, --command command
Pass a single command, without arguments, to the shell with -c.
-h, --help
Print a help message.
-V, --version
Show version number and exit.
EXAMPLES
shell1> flock /tmp -c cat
shell2> flock -w .007 /tmp -c echo; /bin/echo $?
Set exclusive lock to directory /tmp and the second command will fail.
shell1> flock -s /tmp -c cat
shell2> flock -s -w .007 /tmp -c echo; /bin/echo $?
Set shared lock to directory /tmp and the second command will not fail. Notice that attempting to get exclusive lock with second
command would fail.
shell> flock -x local-lock-file echo 'a b c'
Grab the exclusive lock "local-lock-file" before running echo with 'a b c'.
(
flock -n 9 || exit 1
# ... commands executed under lock ...
) 9>/var/lock/mylockfile
The form is convenient inside shell scripts. The mode used to open the file doesn't matter to flock; using > or >> allows the lock-
file to be created if it does not already exist, however, write permission is required. Using < requires that the file already
exists but only read permission is required.
[ "${FLOCKER}" != "$0" ] && exec env FLOCKER="$0" flock -en "$0" "$0" "$@" || :
This is useful boilerplate code for shell scripts. Put it at the top of the shell script you want to lock and it'll automatically
lock itself on the first run. If the env var $FLOCKER is not set to the shell script that is being run, then execute flock and grab
an exclusive non-blocking lock (using the script itself as the lock file) before re-execing itself with the right arguments. It
also sets the FLOCKER env var to the right value so it doesn't run again.
EXIT STATUS
The command uses sysexits.h return values for everything else but an options -n or -w failures which return either the value given by the
-E option, or 1 by default.
AUTHOR
H. Peter Anvin <hpa@zytor.com>
COPYRIGHT
Copyright (C) 2003-2006 H. Peter Anvin.
This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
LAR PURPOSE.
SEE ALSO flock(2)AVAILABILITY
The flock command is part of the util-linux package and is available from Linux Kernel Archive <ftp://ftp.kernel.org/pub/linux/utils/util-
linux/>.
util-linux September 2011 FLOCK(1)