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Finding the part of a filename

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Top Forums Shell Programming and Scripting Finding the part of a filename
# 8  
Old 08-21-2017
Quote:
Originally Posted by csanyipal
I am trying to use this in my ebuild:
Code:
lvcltno=awk 'FNR==1{if(name){close(name)};split(FILENAME, a,".");print a[3];name=FILENAME;nextfile}' \
           opt/VServer/vcomponents/libvclient_release_x64.so.*
dosym libvclient_release_x64.so."${lvcltno}" "${EPREFIX}/usr/$(get_libdir)/libvclient_release_x64.so"

but it does not work, the symlink is not created properly:
Code:
libvclient_release_x64.so -> libvclient_release_x64.so.

It seems that that the link is pointing to it self. Why? How can I fix this?
Hello csanyipal,

Not sure what you are trying to do, so please try my suggestion into a test environment only.
Also in awk we can't use variable values by using $, by seeing your command I tried making following command(considering your command works on shell only).
Code:
awk -vLVCLINTO=${lvcltno} -veprefix=${EPREFIX} -vGET_LIBDIR=$(get_libdir) 'FNR==1{if(name){close(name)};split(FILENAME, a,".");;name=FILENAME;system("dosym libvclient_release_x64.so."LVCLINTO FS eprefix"/usr/"GET_LIBDIR"/libvclient_release_x64.so");nextfile}' /opt/VServer/vcomponents/libvclient_release_x64.so.*

Thanks,
R. Singh
Last edited by RavinderSingh13; 08-21-2017 at 02:37 PM..
# 9  
Old 08-21-2017
Hello R.,
Quote:
Originally Posted by RavinderSingh13
Hello csanyipal,
Not sure what you are trying to do, so please try my suggestion into a test environment only.
R. Singh
I am trying to add the output of your awk command to a variable, and later in my ebuild to use this variable. I search and find how to do it:
Code:
lvcltno="$(awk 'FNR==1{if(name){close(name)};split(FILENAME, a,".");print a[3];name=FILENAME;nextfile}' opt/VServer/vcomponents/libvclient_release_x64.so.*)"
dosym libvclient_release_x64.so."${lvcltno}" "${EPREFIX}/usr/$(get_libdir)/libvclient_release_x64.so"

Now my ebuild creates symlinks properly.
Best, Pál
# 10  
Old 08-21-2017
There is some essential info missing in your specification:
- Is it always the same (root or base, without sequence No.) file name? If not, how is the (partial) file name supplied?
- Is there always one single version only or can there be multiple ? If so, which version do you want?
- Why does specific_filename=libvclient_release_x64.so.* "not do the job"?What's the error?
# 11  
Old 08-21-2017
Quote:
Originally Posted by RudiC
There is some essential info missing in your specification:
- Is it always the same (root or base, without sequence No.) file name? If not, how is the (partial) file name supplied?
- Is there always one single version only or can there be multiple ? If so, which version do you want?
- Why does specific_filename=libvclient_release_x64.so.* "not do the job"?What's the error?
It is always the same file name, without the trailing number which changes only.
I do not understand your second question. Version of what?
# 12  
Old 08-21-2017
Do e.g.
Code:
libvclient_release_x64.so.734
libvclient_release_x64.so.740

exist at the same time?
# 13  
Old 08-21-2017
Quote:
Originally Posted by RudiC
Do e.g.
Code:
libvclient_release_x64.so.734
libvclient_release_x64.so.740

exist at the same time?
No, it does not. There will be only one version of that file out there.

---------- Post updated at 10:13 PM ---------- Previous update was at 10:05 PM ----------

Quote:
Originally Posted by RudiC
There is some essential info missing in your specification:
- Why does specific_filename=libvclient_release_x64.so.* "not do the job"?What's the error?
The answer for the third question follows.
Code:
specific_filename=libvclient_release_x64.so.*
number=${specific_filename##*[.]}
echo $number

The output of third command is:
Code:
libicudata.so 
libicudata.so.54 
libicui18n.so 
libicui18n.so.54 
libicuio.so 
libicuio.so.54 
libicuuc.so 
libicuuc.so.54 
libvclient_release_x64.so 
libvclient_release_x64.so.740 
libvkernel_release_x64.so 
libvkernel_release_x64.so.740 
libvreport_release_x64.so 
libvreport_release_x64.so.740 
libvshared_release_x64.so 
libvshared_release_x64.so.740

and not the number 740.
Last edited by csanyipal; 08-22-2017 at 01:57 AM..
# 14  
Old 08-21-2017
That is difficult to understand or believe, respectively. I touched all those files:
Code:
ls -la lib*
-rw-rw-r-- 1 user user    0 Aug 21 22:26 libicudata.so
-rw-rw-r-- 1 user user    0 Aug 21 22:26 libicudata.so.54
-rw-rw-r-- 1 user user    0 Aug 21 22:26 libicui18n.so
-rw-rw-r-- 1 user user    0 Aug 21 22:26 libicui18n.so.54
-rw-rw-r-- 1 user user    0 Aug 21 22:26 libicuio.so
-rw-rw-r-- 1 user user    0 Aug 21 22:26 libicuio.so.54
-rw-rw-r-- 1 user user    0 Aug 21 22:26 libicuuc.so
-rw-rw-r-- 1 user user    0 Aug 21 22:26 libicuuc.so.54
-rw-rw-r-- 1 user user    0 Aug 21 22:26 libvclient_release_x64.so
-rw-rw-r-- 1 user user    0 Aug 21 20:36 libvclient_release_x64.so.734
-rw-rw-r-- 1 user user    0 Aug 21 22:26 libvclient_release_x64.so.740
-rw-rw-r-- 1 user user    0 Aug 21 22:26 libvkernel_release_x64.so
-rw-rw-r-- 1 user user    0 Aug 21 22:26 libvkernel_release_x64.so.740
-rw-rw-r-- 1 user user    0 Aug 21 22:26 libvreport_release_x64.so
-rw-rw-r-- 1 user user    0 Aug 21 22:26 libvreport_release_x64.so.740
-rw-rw-r-- 1 user user    0 Aug 21 22:26 libvshared_release_x64.so
-rw-rw-r-- 1 user user    0 Aug 21 22:26 libvshared_release_x64.so.740

and there will be just two files found for the pattern you gave:
Code:
echo libvclient_release_x64.so.*
libvclient_release_x64.so.734 libvclient_release_x64.so.740

There should NOT be that multitude of files listed that you present as the output of echo $number. What be the output of echo libvclient_release_x64.so.* in that environment?
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