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Merge lines in text file based on pattern

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# 8  
Old 02-01-2010
Base on your sample data:
Code:
# awk 'BEGIN{FS=OFS="|"}/^[a-z]/{printf (NR==1?_:RS)$1;next}{$1=_;printf}' infile
zhudla.it|zkazit <co>|zpackat
vrch|kopec|pahorek|vr.ek|vyvý.enina|pahorkatina|vrchovina|vrchol|povrch|ho.ej.ek|1|ha.te.it se|hádat se|.kádlit se
spurtovat|zrychlit b.h|fini.ovat
oplést|ovinout <co .ím>|omotat|obto.it
báze|základ|základna|podklad|východisko|zásada|alkálie|1|lou.it se <s kým>|roz.ehnávat se
zahnat|odehnat <koho>|zapudit|zapla.it|ukojit (hlad)|uti.it|za.ehnat|odnést <co kam> (bou.e)
rozoh.ovat se|rozvá..ovat se|rozpalovat se|uklid.ovat se
p.ipamatovat|p.ipomenout|vzpomenout|upamatovat|zapomenout
propít|utratit (pitím)|prohý.it|prochlastat
dopustit se|spáchat (zlo.in)|provést
klepnout|.uknout|kliknout (tla.ítkem)|cvaknout|zasáhnout <koho>|pra.tit|zabít|ranit (mrtvice)|popovídat si|poklepat si|zdrbnout si
zotro.ený|utla.ený|porobený|nesvobodný

Use gawk, nawk or /usr/xpg4/bin/awk on Solaris.
# 9  
Old 02-02-2010
I could not make it work danmero. Anyway, thank you for your time.

Here is command which worked (it added pipe character to the end of each line also).
Code:
awk -F\| -v OFS=\| '/^\(/{sub(/[^|]*|/,"");var=var $0;next}var{print var "|" }{NF--;var=$0}END{print var "|"}' file

Credit for this command is going to pgas from #awk at irc.freenode.net
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