Created
September 15, 2021 19:01
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Parallel recursive bash mergesort
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| #!/bin/bash | |
| tms="/tmp/ms.$1" | |
| rm -f ${tms}[01] | |
| IFS='' | |
| while read line1 | |
| do | |
| let n1=n1+1; echo $line1 >> ${tms}0 | |
| if read line2; then let n2=n2+1; echo $line2 >> ${tms}1; fi | |
| done | |
| tsm="/tmp/sm.$1" | |
| if [[ n1 -gt 1 ]]; then (cat ${tms}0 | $0 ${1}0)& else cp ${tms}0 ${tsm}0& fi | |
| pid1=$! | |
| if [[ n2 -gt 1 ]]; then (cat ${tms}1 | $0 ${1}1)& else cp ${tms}1 ${tsm}1& fi | |
| pid2=$! | |
| wait $pid1 $pid2 | |
| # echo "merge(${tsm}0,${tsm}1)" | |
| cmd="comm ${tsm}0 ${tsm}1 | sed \"s/^\t\t\(.*\)$/\10xa\1/; s/^\t//\"" | |
| if [[ "$1" != "" ]]; then out=" > /tmp/sm."$1; fi | |
| eval $cmd $out | |
| rm /tmp/ms.${1}[01] /tmp/sm.${1}[01] |
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https://www.raspberrypi.org/forums/viewtopic.php?f=31&t=319687
