Commit 8b82620d authored by Mukund Sivaraman's avatar Mukund Sivaraman
Browse files

[2968] Document the sed command

parent 6f11ce8d
......@@ -140,6 +140,21 @@ get_schema() {
copy_file $1 $db1
# The purpose of the following sed command is to join multi-line SQL
# statements to form single-line SQL statements.
# The sed command is explained as follows:
# ':a' creates a new label "a"
# 'N' appends the next line to the pattern space
# '$!ba' if it's not the last line, branch to "a"
# The above makes sed loop over the entire sqlite3 output. At this
# point, the pattern space contain all lines in the sqlite3 output.
# 's/,[\ ]*\n/, /g' then substitutes lines trailing with comma
# followed by zero or more spaces and the newline character, with
# just a comma and a single space.
db_schema=`sqlite3 $db1 '.schema' | \
sed -e ':a' -e 'N' -e '$!ba' -e 's/,[\ ]*\n/, /g' | \
sort | \
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