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dd=$(date +%d) # values 08 and 09 will not work with arithmetic the way you expect d=${dd#0} # remove any leading 0 if [ "$d" -ge 16 ] ;then half=16 else half=01 fi date "+%Y%m$half" I t …

If perl is available, I find it can be more readable than other solutions, specifically because its regex language is more expressive and it has the /x modifier, which allows for writing clearer regex …

Although I'm impressed by the reduced linecount and improved efficiency of other answers, I'd like to offer a different approach which prioritizes simplicity of code. This approach will make your fut …

Maybe I'm missing it, but I don't find it documented that cd '' should succeed. Since there is no directory with the name '', it seems obvious that it should fail. For example, mydir= cd -- "$mydir" …

Another choice: use functions. $ cat tt #!/bin/bash mon() { echo " Mon" ; } tue_fri() { echo " Tue|Wed|Thu|Fri" ; } fri_sun() { echo " Fri|Sat|Sun" ; } now=$(date +"%a") [[ …

Some more simple variations: cat IP | sed 's/$/, /' | tr -d '\n' | sed 's/, $/\n/' or cat IP | perl -pe 's/\n/, /' | perl -pe 's/, $/\n/'

To handle arbitrary values: #!/bin/bash cat <<EOF >json [ { "item1": "value1", "item2": " val'\"ue2 ", "sub items": [ { "subitem": "subvalue" } ] }, { " …