Database Reference
In-Depth Information
$ seq 5 | header -a count | body wc -l
count
5
Note that the header is not used, and is also printed again in the output.
The second command-line tool, header , allows us, as the name implies, to manipuā€
late the header of a CSV file. The complete source code is as follows:
#!/usr/bin/env bash
get_header () {
for i in $( seq $NUMROWS ) ; do
IFS = read -r LINE
OLDHEADER = "${OLDHEADER}${LINE}\n"
done
}
print_header () {
echo -ne "$1"
}
print_body () {
cat
}
OLDHEADER =
NUMROWS = 1
while getopts "dn:ha:r:e:" OPTION
do
case $OPTION in
n )
NUMROWS = $OPTARG
;;
a )
print_header "$OPTARG\n"
print_body
exit 1
;;
d )
get_header
print_body
exit 1
;;
r )
get_header
print_header "$OPTARG\n"
print_body
exit 1
;;
e )
get_header
print_header "$(echo -ne $OLDHEADER | eval $OPTARG)\n"
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