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Safer use of crontab. Add this function to the user's ~/.profile or ~/.bashrc
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| crontab() { | |
| crontab_usage() { | |
| echo 'Usage:' >&2 | |
| echo ' $ crontab -[elr]' >&2 | |
| echo ' $ crontab ~/crons # to update your crons' >&2 | |
| } | |
| if [ $# -eq 1 ]; then | |
| if [ "$*" = '-' ]; then # worse than crontab -e | |
| crontab_usage | |
| elif [[ ! "$*" =~ ^-[a-zA-Z]$ ]]; then | |
| /usr/bin/crontab $* | |
| else | |
| OPTIND=1 | |
| while getopts 'elr' cronopt; do | |
| case "$cronopt" in | |
| e) | |
| (echo "'crontab -e' is disabled for $USER" | |
| echo 'To update your crons, please edit ~/crons, then load the' | |
| echo 'updated file:' | |
| echo | |
| echo ' $ crontab ~/crons' | |
| echo | |
| echo 'If this file does not yet exist (or to ensure it is up to date!)' | |
| echo 'you can create it as follows:' | |
| echo | |
| echo ' $ crontab -l >~/crons') >&2 | |
| ;; | |
| r) | |
| (echo 'You may not delete the crontab. To make changes, edit' | |
| echo '~/crons (which may be empty) and load the updated file:' | |
| echo | |
| echo ' $ crontab ~/crons') >&2 | |
| ;; | |
| l) | |
| /usr/bin/crontab -l | |
| ;; | |
| *) | |
| crontab_usage | |
| ;; | |
| esac | |
| done | |
| OPTIND=1 | |
| fi | |
| else | |
| crontab_usage | |
| fi | |
| unset -f crontab_usage | |
| } |
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