====== Shell Built-ins ======
===== Ksh/Bash =====
==== String operations ====
<code bash># Strip extension:
${var%.ext}

# Strip filename (extract directory):
${path%/*}

# Strip path (extract filename):
${path##*/}</code>
==== Variable assignation ====
<code bash># Valeur par defaut:
var2=${var1:-valDef}</code>