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Dd (Unix)
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=== Progress feedback === On request, the command reports progress. When it receives signal {{code|USR1}} ({{code|INFO}} on BSD systems), it writes the number of transferred blocks to standard error. The following bash script requests progress every 10 seconds until the transfer completes. The text ''PID'' stands for the {{code|dd}} process identifier. <syntaxhighlight lang="bash"> while kill -USR1 PID ; do sleep 10 ; done </syntaxhighlight> Newer versions of GNU ''dd'' support the option {{code|status{{=}}progress}} which enables periodic status feedback.<ref name=gnu_invok>{{cite web |url=https://www.gnu.org/software/coreutils/manual/html_node/dd-invocation.html |title=GNU Coreutils: dd invocation |website=The GNU Operating System and the Free Software Movement |access-date=2019-08-26 |archive-date=2019-08-22 |archive-url=https://web.archive.org/web/20190822014954/http://www.gnu.org/software/coreutils/manual/html_node/dd-invocation.html |url-status=live }}</ref>
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