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You could do something like

getdayname () {
date -d "$(( $(date -d "$(( 7-$(date '+%u') )) days" '+%u')+$1 )) days"  '+%A'
}

and run getdayname 2, getdayname 7 etc (assuming gnu date).
Or simply use an array and do without the date e.g.

getdayname () {
local days=( Sunday Monday Tuesday Wednesday Thursday Friday Saturday )
printf %s\\n ${days[$1]}
}

though with bash/ksh you need printf %s\\n "${days[$1-1]}" (as indexing starts at 0), and quotes are needed to avoid split+glob (also with yash).

You could get the date for next Sunday, add N days and print the day name for that particular date:

getdayname () {
nextplus=$(date -d "next Sunday +$1 days")
date -d "${nextplus}" '+%A'
}

and run getdayname 2, getdayname 7 etc (assuming gnu date).
Or simply use an array and do without the date e.g.

getdayname () {
local days=( Sunday Monday Tuesday Wednesday Thursday Friday Saturday )
printf %s\\n ${days[$1]}
}

though with bash/ksh you need printf %s\\n "${days[$1-1]}" (as indexing starts at 0), and quotes are needed to avoid split+glob (also with yash).

You could do something like

getdayname () {
date -d "$(( $(date -d "$(( 7-$(date '+%u') )) days" '+%u')+$1 )) days"  '+%A'
}

and run getdayname 2, getdayname 7 etc (assuming gnu date).
Or simply use an array and do without the date e.g.

getdayname () {
local days=( Sunday Monday Tuesday Wednesday Thursday Friday Saturday )
printf %s\\n ${days[$1]}
}

though with bash/ksh you need printf %s\\n ${days[$1-1]} (as indexing starts at 0)

You could do something like

getdayname () {
date -d "$(( $(date -d "$(( 7-$(date '+%u') )) days" '+%u')+$1 )) days"  '+%A'
}

and run getdayname 2, getdayname 7 etc (assuming gnu date).
Or simply use an array and do without the date e.g.

getdayname () {
local days=( Sunday Monday Tuesday Wednesday Thursday Friday Saturday )
printf %s\\n ${days[$1]}
}

though with bash/ksh you need printf %s\\n "${days[$1-1]}" (as indexing starts at 0), and quotes are needed to avoid split+glob (also with yash).

You could do something like

getdayname () {
date -d "$(( $(date -d "$(( 7-$(date '+%u') )) days" '+%u')+$1 )) days"  '+%A'
}

and run getdayname 2, getdayname 7 etc (assuming gnu date).
Or simply use an array and do without the date e.g.

getdayname () {
local days=( Sunday Monday Tuesday Wednesday Thursday Friday Saturday )
printf %s\\n ${days[$1]}
}

though with bash/ksh you need printf %s\\n ${days[$1-1]} (as indexing starts at 0)

You could do something like

getdayname () {
date -d "$(( $(date -d "$(( 7-$(date '+%u') )) days" '+%u')+$1 )) days"  '+%A'
}

and run getdayname 2, getdayname 7 etc (assuming gnu date).
Or simply use an array and do without the date e.g.

getdayname () {
local days=( Sunday Monday Tuesday Wednesday Thursday Friday Saturday )
printf %s\\n ${days[$1]}
}

though with bash/ksh you need printf %s\\n ${days[$1-1]} (as indexing starts at 0)