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<p class="MsoNormal"><span lang="EN-US">I just noticed that a normal unix shell pipe return the exits status of the last command.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">For example<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"># false|true<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">returns true<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">in perl:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"># perl -e 'system("false | true");print $?>>8,"\n"'<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">0<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Instead, we want such command to fails. For example, consider a backup<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">which piped the output to another command (gzip).<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">see also <a href="https://bugzilla.proxmox.com/show_bug.cgi?id=264">
https://bugzilla.proxmox.com/show_bug.cgi?id=264</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">I tried to use option ‘pipefail’ but get:<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"># perl -e 'system("set -o pipefail;false | true");print $?>>8,"\n"'<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">set: 1: Illegal option -o pipefail<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Any ideas?<o:p></o:p></span></p>
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