Sending output of program into subsequent commands (i.e. awk/sort) Post: 303036399

Sponsored Content

Top Forums Shell Programming and Scripting Sending output of program into subsequent commands (i.e. awk/sort) Post 303036399 by sand1234 on Tuesday 25th of June 2019 01:48:50 AM

06-25-2019

Registered User

Sending output of program into subsequent commands (i.e. awk/sort)

Hi,

I have identified how to use command chaining as per below on a file, to capture the header of a file, as well as the line containing the C: drive.

Code:

$ cat test.txt
Filesystem      Size  Used Avail Use% Mounted on
rootfs          237G  153G   84G  65% /
none            237G  153G   84G  65% /dev
none            237G  153G   84G  65% /run
none            237G  153G   84G  65% /run/lock
none            237G  153G   84G  65% /run/shm
none            237G  153G   84G  65% /run/user
C:              237G  153G   84G  65% /mnt/c

$ cat <(head -n1 test.txt) <(awk '/C/' test.txt)
Filesystem      Size  Used Avail Use% Mounted on
C:              237G  153G   84G  65% /mnt/c

I am trying to use the same logic on the output of a command, but it does not work. How can I get this to work?

Aim is to sort docker images by size column on the right, while printing the first line (header).

Code:

$ docker image ls
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
alpine              latest              4d90542f0623        5 days ago          5.58MB
ubuntu              xenial              13c9f1285025        6 days ago          119MB
ubuntu              latest              4c108a37151f        6 days ago          64.2MB
centos              latest              9f38484d220f        3 months ago        202MB
linode/lamp         latest              2359fa12fded        4 years ago         372MB

$ docker image ls | awk 'NR>1' | sort -k5 -V -r
linode/lamp         latest              2359fa12fded        4 years ago         372MB
centos              latest              9f38484d220f        3 months ago        202MB
ubuntu              xenial              13c9f1285025        6 days ago          119MB
ubuntu              latest              4c108a37151f        6 days ago          64.2MB
alpine              latest              4d90542f0623        5 days ago          5.58MB

$ docker image ls | (awk 'NR==1') <(sort -k5 -V -r)
-bash: syntax error near unexpected token `<(sort -k5 -V -r)'  <----- failure
$ docker image ls
REPOSITORY          TAG                 IMAGE ID            CREATED             SIZE
alpine              latest              4d90542f0623        5 days ago          5.58MB
ubuntu              xenial              13c9f1285025        6 days ago          119MB
ubuntu              latest              4c108a37151f        6 days ago          64.2MB
centos              latest              9f38484d220f        3 months ago        202MB
linode/lamp         latest              2359fa12fded        4 years ago         372MB

Thanks

Last edited by sand1234; 06-29-2019 at 11:52 PM..

sand1234

View Public Profile for sand1234

Find all posts by sand1234

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

combining unix commands and awk program

Dear Experts I am trying to find if it is possible to combine unix commands in awk program. For example if it is possible embed rm or ls or any unix command inside the awk program and while it is reading the file besides printing be able to do some unix commands. I am thinking may be just print...

2. UNIX for Dummies Questions & Answers

Using the Sort, Cut, and Awk commands

Hello, I am trying, utilizing the few commands I know, to extract all records within my file that were generated in November of 2007. Each record within the file has a "date" field giving the month, day, and year (9-8-88). How do I extract those records to their own file? Once I extract...

3. UNIX for Dummies Questions & Answers

Sending awk output to nothing?

How can I direct awk output to go nowhere? I can write the data to a file easy enough or print it on the screen. But for this particular command I don't actually want the data and I don't want to create a file. I just want the data discarded. Thanks in advance

4. Shell Programming and Scripting

awk text record - prepend first field to all subsequent fields

Hello everyone, I've suddenly gotten very interested in sed and awk (and enjoying it quite a bit too) because of a large conversion project that we're working on. I'm currently stuck with a very inefficient process for processing text blocks. I'm sure someone here should be able to easily point out...

5. Shell Programming and Scripting

awk - use fields from subsequent lines

I've run into a problem getting exactly what I want out of awk - some folks may recognize this as an output from Amazon's ec2-describe-instances: Given the following: INSTANCE i-4960f321 BLOCKDEVICE Line2Var2 TAG instance i-4960f321 Name web1 TAG instance i-4960f321...

6. UNIX for Dummies Questions & Answers

is there a way to assing variable a value that is output of a program in awk script?

Hi there is there a way to assing variable a value that is output of a program in awk script. For e.g., I did temp=(`grep "" $5 | cut -f8 -d' '`) but it does not work. Any advice??? Thanks in advance!!! :)

7. Shell Programming and Scripting

Want to sort a file using awk & sed to get required output

Hi All, Need Suggestion, Want to sort a file using awk & sed to get required, output as below, such that each LUN shows correct WWPN and FA port Numbers correctly: Required output: 01FB 10000000c97843a2 8C 0 01FB 10000000c96fb279 9C 0 22AF 10000000c97843a2 8C 0 22AF 10000000c975adbd ...

8. Shell Programming and Scripting

Pipe or combine output of three awk commands

What is the correct syntax to pipe or run three awk commands? Basically, using the output of the first awk as input in the second. Then using the output of the second awk in the third. Thank you :). awk 'FNR==NR {E; next }$3 in E {print $3, $5}' panel_genes.txt RefSeqGene.txt > update.txt |...

9. Shell Programming and Scripting

awk capturing first sample, but not subsequent id's

In the awk below the first sample MEV45 gets extracted from the html, but the subsequent MEV46 and MEV47 do not as they are not part of parse. I can not seem to add them to the code. Thank you very much @RudiC your awk is very nice :). input {"barcodeId": "IonXpress", "barcodedSamples":...

10. Shell Programming and Scripting

awk Sort 2d histogram output from min(X,Y) to max(X,Y)

I've got Gnuplot-format 2D histogram data output which looks as follows. 6.5 -1.25 10.2804 6.5404 -1.25 10.4907 6.58081 -1.25 10.8087 6.62121 -1.25 10.4686 6.66162 -1.25 10.506 6.70202 -1.25 10.3084 6.74242 -1.25 9.68256 6.78283 -1.25 9.41229 6.82323 -1.25 9.43078 6.86364 -1.25 9.62408...

LEARN ABOUT DEBIAN

cdde.xml

cdde.xml(5)															       cdde.xml(5)

NAME

       cdde.xml - Configuration file for cdde

DESCRIPTION

       When cdde is run for the first time, an example xml configuration file (~/.cdde.xml) is created for you:

       <?xml version="1.0"?>
       <cdde delay="5000000">
	 <drive path="/dev/cdrom">
	   <audio command="echo An audio cd was inserted."/>
	   <data command="echo A data cd was inserted."/>
	   <dvd command="echo A dvd was inserted."/>
	   <vcd command="echo A vcd was inserted."/>
	   <svcd command="echo A svcd was inserted."/>
	   <blank command="echo A blank cdr/dvdr was inserted."/>
	   <mixed command="echo A mixed (audio/data) cd was inserted."/>
	 </drive>
       </cdde>

       This  default  file is not very useful, and so I suggest you to edit it to your needs before running cdde again.  You may add as many drive
       entries, or commands as you like.  If multiple entries are found for a type of disc then all entries will be run  in  the  order  they  are
       found.

       The specific device in use can be passed to the command with one of the following special tags:

	 %dev%	-  is replaced with the device name of the cdrom that
		   just had a disc inserted

	 %mnt%	-  is replaced with the listed mount point for the
		   cdrom that just had a disc inserted

       Note:	%mnt%  is determined through your fstab (usually located in /etc) file. If you do not have a listing for each <drive> in the fstab
       this will cause problems.

       This way, you can tell your video player which device to use when playing a VCD, for example.

EXAMPLE

       This is an example of ~/.cdde.xml file:

       <?xml version="1.0"?>
       <cdde delay="5000000">
	 <drive path="/dev/cdroms/cdrom0"/>
	   <audio command="xmms %mnt%"/>
	   <data command="mount %mnt%"/>
	   <dvd
	    command="xterm -iconic -e mplayer -fs -xineramascreen 1 -dvd 1"/>
	   <vcd
	    command="xterm -iconic -e mplayer -fs -xineramascreen 1 -vcd 1"/>
	   <svcd
	    command="xterm -iconic -e mplayer -fs -xineramascreen 1 -vcd 1"/>
	   <blank command="gcombust"/>
	   <mixed command="mount %mnt%"/>
	 </drive>
       </cdde>

FILES

       ~/.cdde.xml

SEE ALSO

       cdde(1)

AUTHORS

       Eric Lathrop <eric@ericlathrop.com>
       Stanislav Maslovski <stanislav.maslovski@gmail.com>

WEBSITE

       For the latest release of cdde, see:
       http://cdde.sourceforge.net/

Eric Lathrop							       0.3.1							       cdde.xml(5)