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als RSS Feed abonnieren๐ HPR3625: Shell Tips and Snippets - Collaborative Effort
๐ก Newskategorie: Podcasts
๐ Quelle: hackerpublicradio.org
Carl talks about a method to move function definitions to the bottom of a script using sed:
#!/bin/sh
source <(sed '1,/^exit/ d' $0)
__say "hello"
exit
__say()
{
echo $1
}
Guest Host #1 (scroll to the bottom to ruin the surprise) talks about the shift command using this example:
startdate="$1" # Pick up date
shift
days=0
# Loop through args and create events
while [ $1 ] ; do # as many times as you add a timestamp
[ $1 != "off" ] && khal new $(date -j -v+"$days"d -f %Y-%m-%d +%Y-%m-%d $startdate) $1 8H Work
let days++
shift
done
Guest Host #2 provides tips and examples on how to use variables safely and politely provide default values. One example of assigning a default value is:
foo=${foo:-"blah"}
Carl then closes out with the : (colon) shell builtin and provides a variation on the above default value:
: ${foo:="blah"}