文件操作 - 15-timezone
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文件: /usr/share/dhcpcd/hooks/15-timezone
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# Configure timezone : ${localtime:=/etc/localtime} set_zoneinfo() { [ -z "$new_tzdb_timezone" ] && return 0 zoneinfo_dir= for d in \ /usr/share/zoneinfo \ /usr/lib/zoneinfo \ /var/share/zoneinfo \ /var/zoneinfo \ ; do if [ -d "$d" ]; then zoneinfo_dir="$d" break fi done if [ -z "$zoneinfo_dir" ]; then syslog warning "timezone directory not found" return 1 fi zone_file="$zoneinfo_dir/$new_tzdb_timezone" if [ ! -e "$zone_file" ]; then syslog warning "no timezone definition for $new_tzdb_timezone" return 1 fi if copy_file "$zone_file" "$localtime"; then syslog info "timezone changed to $new_tzdb_timezone" fi } # For ease of use, map DHCP6 names onto our DHCP4 names case "$reason" in BOUND6|RENEW6|REBIND6|REBOOT6|INFORM6) new_tzdb_timezone="$new_dhcp6_tzdb_timezone" ;; esac if $if_configured && $if_up; then set_zoneinfo fi
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将文件时间修改为当前时间的前一年
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