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Re: xargs combined with awk


From: giuseppe . amatulli
Subject: Re: xargs combined with awk
Date: Fri, 21 Dec 2012 13:14:34 -0800 (PST)
User-agent: G2/1.0

thanks to all of you.
in the end i selected 
the following solution

-c $' ....   awk  \'{}\'  ....    '

all the best
giuseppe

On Thursday, 20 December 2012 09:43:50 UTC-6, address@hidden  wrote:
> Hi,
> 
> have this a for loop which is sending the "dir" variable one for each 
> processor.
> 
> 
> 
> 
> 
> for dir in UA_tile_tif_pop_txt UA_buf10_tile_tif_pop_txt 
> UA_buf20_tile_tif_pop_txt UA_buf30_tile_tif_pop_txt UA_buf40_tile_tif_pop_txt 
> UA_buf50_tile_tif_pop_txt ; do echo $dir ; done | xargs  -n 1 -P 6 bash -c '
> 
> IN_UA=/weldgfs/p51/gius_urban/pop_urban/buffer_tif
> 
> dir="$1"
> 
> 
> 
> join -1 2  -2 1 $IN_UA/$dir/UA_block_sum_s.txt     
> $IN_UA/$dir/UA_popD_all.txt       > $IN_UA/$dir/UA_block_sum_popD.txt
> 
> join -1 2  -2 1 $IN_UA/$dir/UA_block_sum_popD.txt  
> $IN_UA/$dir/UA_hunitD_all.txt > $IN_UA/$dir/UA_block_sum_popD_hunitD.txt
> 
> 
> 
> ' _ 
> 
> 
> 
> The loop works fine, no issues. 
> 
> When i'm insert an awk command in the -c ' ' _     
> 
> I get an error. 
> 
> 
> 
> e.g. 
> 
> 
> 
> 
> 
> for dir in UA_tile_tif_pop_txt UA_buf10_tile_tif_pop_txt 
> UA_buf20_tile_tif_pop_txt UA_buf30_tile_tif_pop_txt UA_buf40_tile_tif_pop_txt 
> UA_buf50_tile_tif_pop_txt ; do echo $dir ; done | xargs  -n 1 -P 6 bash -c '
> 
> IN_UA=/weldgfs/p51/gius_urban/pop_urban/buffer_tif
> 
> dir="$1"
> 
> 
> 
> awk '{ print $2 }' $IN_UA/$dir/UA_block_sum_s.txt  > $IN_UA/$dir/test.txt
> 
> 
> 
> ' _
> 
> 
> 
> 
> 
> awk: cmd. line:1: {
> 
> awk: cmd. line:1:  ^ unexpected newline or end of string
> 
> 
> 
> 
> 
> I try to escape with the \ the ' and the } but no good results.
> 
> any idea how how i can insert awk function in xargs bash -c '  '_ syntax?
> 
> 
> 
> I would like to avoid to create an external script and called it by 
> 
> xargs bash myscript.sh 
> 
> 
> 
> thanks in advance 
> 
> Giuseppe



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