//View Tip #155
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The script below will truncate the $PWD to 1/4 of the terminal width and put it into the command prompt, all within the same bash process, no forks to tr and gawk.

function truncate_pwd

local pwdmaxlen=$((${COLUMNS:-80}/4))
if [ ${#newPWD} -gt $pwdmaxlen ]
newPWD=".+${newPWD: -$pwdmaxlen}"

PS1="${ttyname}@\h:\${newPWD}\\$ "

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