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Full Discussion: Cannot extract libraries using sed
Top Forums UNIX for Beginners Questions & Answers Cannot extract libraries using sed Post 303037865 by sand1234 on Thursday 15th of August 2019 09:42:03 AM
Old 08-15-2019
Hi MadeinGermany,

Thanks for the responses, nice idea(s). The line without => is not captured via your regex, however DonCragun has provided some details around this.

Code:
 /lib64/ld-linux-x86-64.so.2 (0x00007fc21e165000)

Hi DonCragun,

Thanks for the response.

The initial solution with awk/tr/sort works. Looks like it is successful as the lines which do not have => as delimiter are left untouched by tr anyway.

Code:
./copy_chroot_lib.sh ls echo | tr '=>' '\n' | awk '/\/lib/{print $1}' | sort -u
/lib64/ld-linux-x86-64.so.2   <------------ line without => is included
/lib/x86_64-linux-gnu/libc.so.6
/lib/x86_64-linux-gnu/libdl.so.2
/lib/x86_64-linux-gnu/libpcre.so.3
/lib/x86_64-linux-gnu/libpthread.so.0
/lib/x86_64-linux-gnu/libselinux.so.1

The awk solution is nice and works, as I only need to remove duplicates. Sed is also good, but a little complex to understand.

Can you please explain the following awk code?

Code:
 ./copy_chroot_lib.sh ls echo | awk '$(NF-1) ~ "^/lib" {o[$(NF- 1)]} END {for(f in o) print f}'

From what I understand, if the second last field starts with /lib, the field is put into an array named o. Then the array is traversed and the value of all array elements printed out. How does this remove duplicates?

Thanks.
 

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LEARN ABOUT DEBIAN

nwbpset

NWBPSET(1)							      nwbpset								NWBPSET(1)

NAME

       nwbpset - Create a bindery property or set its value

SYNOPSIS

       nwbpset [ -h ] [ -S server ] [ -U user name ] [ -P password | -n ] [ -C ]

DESCRIPTION

       nwbpset Reads a property specification from the standard input and creates and sets the corresponding property. The format is determined by
       the output of 'nwbpvalues -c'. nwbpset will hopefully become an important part of the bindery management  suite	of  ncpfs,  together  with
       'nwbpvalues -c'. See util/nwbpsecurity for an example.

       As another example, look at the following command line:

	 nwbpvalues -t 1 -o supervisor -p user_defaults -c |
	 sed '2s/.*/ME/'|
	 sed '3s/.*/LOGIN_CONTROL/'|
	 nwbpset

       With  this command, the property user_defaults of the user object 'supervisor' is copied into the property login_control of the user object
       'me'.

	 nwbpvalues -t 1 -o me -p login_control -c |
	 sed '9s/.*/ff/'|
	 nwbpset

       This command disables the user object me.

       Feel free to contribute other examples!

       nwbpset looks up the file $HOME/.nwclient to find a file server, a user name and possibly a password. See nwclient(5) for more information.
       Please note that the access permissions of $HOME/.nwclient MUST be 600 for security reasons.

OPTIONS

       -h
	  -h is used to print out a short help text.

       -S server
	  server is the name of the server you want to use.

       -U user
	  user is the user name to use for login.

       -P password
	  password  is	the  password to use for login. If neither -n nor -P are given, and the user has no open connection to the server, nwbpset
	  prompts for a password.

       -n
	  -n should be given if no password is required for the login.

       -C
	  By default, passwords are converted to uppercase before they are sent to the server, because most servers require this. You can turn off
	  this conversion by -C.

AUTHORS

       nwbpset was written by Volker Lendecke. See the Changes file of ncpfs for other contributors.

nwbpset 							     8/7/1996								NWBPSET(1)
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