tgoz / posix_string

String replacement and templating in posix shell

Believed to be compatible with Bourne (posix), ash, dash, bash, zsh, and probably other similar shells.

Templating is driven by shell substitutions in [{[ ]}]. Contents of substitution may be anything which can be echo'ed; in particular, shell variables (e.g. ${VAR} ) and commands (e.g. $(date) ).

Examples

# define functions
. ./replace
. ./apply_template

echo -n "Input string" | replace t T

echo -n 'pid=[{[$$]}]' | apply_template

cat <<'EOF' | apply_template
Document generated at [{[$(date)]}]

User [{[${USERNAME}]}] has uid=[{[$UID]}].

PID=[{[$$]}]
EOF