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diff --git a/installer/linux/songbird.sh b/installer/linux/songbird.sh
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index ece9dbb..a325ed9 100755
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--- a/installer/linux/songbird.sh
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+++ b/installer/linux/songbird.sh
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@@ -158,7 +158,7 @@ moz_run_program()
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if [ "$DEBUG_CORE_FILES" ]
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then
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crc_old=
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- if [ -f core ]
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+ if [ -f core -a -r core ]
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then
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crc_old=`$crc_prog core | awk '{print $1;}' `
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fi
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@@ -170,7 +170,7 @@ moz_run_program()
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exitcode=$?
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if [ "$DEBUG_CORE_FILES" ]
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then
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- if [ -f core ]
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+ if [ -f core -a -r core ]
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then
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crc_new=`$crc_prog core | awk '{print $1;}' `
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fi
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