Sponsored Content
Top Forums UNIX for Advanced & Expert Users Which cut command is more efficient? Post 302508634 by Corona688 on Monday 28th of March 2011 03:11:32 PM
Old 03-28-2011
Quote:
Originally Posted by shamrock
cat's behavior can be altered by supplying cmd. line flags so why would it read in chunks...
Because it usually doesn't need to care about line boundaries. Stopping in the middle of a line won't make it "binary". (though cat without parameters ought to be binary-safe.) What blocks it does I/O in won't change the content of said I/O, a line too long for the block will just take a couple blocks to finish.
This User Gave Thanks to Corona688 For This Post:
 

9 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

cut command

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)
Discussion started by: rookie22
3 Replies

2. Shell Programming and Scripting

Cut command

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)
Discussion started by: ragavhere
1 Replies

3. Shell Programming and Scripting

Help with cut command

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)
Discussion started by: tru_tell
3 Replies

4. Shell Programming and Scripting

Cut Command error cut: Bad range

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)
Discussion started by: dgmm
2 Replies

5. UNIX for Dummies Questions & Answers

Cut pid from ps using cut command

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)
Discussion started by: ran ber
8 Replies

6. Shell Programming and Scripting

Cut command

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)
Discussion started by: ATWC
4 Replies

7. UNIX for Beginners Questions & Answers

Cut command: can't make it cut fields

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)
Discussion started by: scrutinizerix
9 Replies

8. Shell Programming and Scripting

Combining awk command to make it more efficient

VARIABLE="jhovan 5259 5241 0 20:11 ? 00:00:00 /proc/self/exe --type=gpu-process --channel=5182.0.1597089149 --supports-dual-gpus=false --gpu-driver-bug-workarounds=2,45,57 --disable-accelerated-video-decode --gpu-vendor-id=0x80ee --gpu-device-id=0xbeef --gpu-driver-vendor... (3 Replies)
Discussion started by: SkySmart
3 Replies

9. Shell Programming and Scripting

Efficient way to combine command

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
mcx convert(1)							  USER COMMANDS 						    mcx convert(1)

  NAME
      mcx convert - convert between mcx storage types

  SYNOPSIS
      mcx convert <matrix-file-in> <matrix-file-out>
      mcx convert [--write-binary] --cone-to-stack <cat-file-in> <cat-file-out>
      mcx convert [--write-binary] --stack-to-cone <cat-file-in> <cat-file-out>

      mcxconvert  is  not  in  actual fact a program. This manual page documents the behaviour and options of the mcx program when invoked in mode
      convert. The options -h, --apropos, --version, -set, --nop, -progress <num> are accessible in all mcx modes. They are described in  the  mcx
      manual page.

      mcx  convert  [--cone-to-stack  (transform  cone	file to stack file)] [--stack-to-cone (transform stack file to cone file)] [--write-binary
      (output native binary format)] [--cat (read and write cat format)] [-cat-max <num> (limit the stack conversion to <num> matrices)]

      In the two-argument invocation without additional arguments, mcx convert converts from the format found in the first file to the other  for-
      mat, i.e.  from native interchange to native binary format or the other way around. When querying with the -q option, mcx{convert} will out-
      put a one-line synopsis describing the matrix in the argument. The --cone-to-stack and --stack-to-cone options convert between the two types
      of concatenated output provided by mclcm.

  DESCRIPTION
      The  mcl	libraries make extensive use of matrices. Matrices are used to encode graphs, matrices and clusterings.  They can be stored either
      in interchange or in binary format. The latter is somewhat more efficient in storage and much faster in both reading and	writing,  but  the
      default is interchange format.

      The  mcl input routines recognize the type of storage they are dealing with. If you want to convert a matrix to the other storage type, sim-
      ply specify the file name of the matrix you want to convert.  mcx convert will recognize its type, and write the	other  type  to  the  file
      specified as the second argument.

  OPTIONS
      --cone-to-stack (transform cone file to stack file)
	This option requires two trailing options, the names of respectively the source cone file and the target stack file.

      --stack-to-cone (transform stack file to cone file)
	This option requires two trailing options, the names of respectively the source stack file and the target cone file.

      --cat (read and write cat format)

      -cat-max <num> (limit the stack conversion to <num> matrices)

      --write-binary (output native binary format)
	This option is only useful with either of the options --cone-to-stack, --stack-to-cone, or --cat.

  AUTHOR
      Stijn van Dongen.

  SEE ALSO
      mcxio(5), and mclfamily(7) for an overview of all the documentation and the utilities in the mcl family.

  mcx convert 12-068						      8 Mar 2012						      mcx convert(1)
All times are GMT -4. The time now is 06:41 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy