diff options
Diffstat (limited to 'print.html')
| -rw-r--r-- | print.html | 57 |
1 files changed, 46 insertions, 11 deletions
@@ -998,6 +998,7 @@ status -f # abs path of current file <li><a href="cli/./tac.html">tac</a></li> <li><a href="cli/./rev.html">rev</a></li> <li><a href="cli/./paste.html">paste</a></li> +<li><a href="cli/./xargs.html">xargs</a></li> </ul> <div style="break-before: page; page-break-before: always;"></div><h1 id="awk1"><a class="header" href="#awk1">awk(1)</a></h1> <pre><code class="language-markdown">awk [opt] program [input] @@ -1404,6 +1405,24 @@ echo -e 'a1 a2\nb1 b2\nc1 c2\nd1 d2' | paste - - # a1 a2 b1 b2 # c1 c2 d1 d2 </code></pre> +<div style="break-before: page; page-break-before: always;"></div><h1 id="xargs1"><a class="header" href="#xargs1">xargs(1)</a></h1> +<pre><code>xargs [opts] [cmd [init-args]] + -l [<num>] maximal number of lines per cmd invocation + if <num> it not provided, num=1 is assumed + -I <str> replace <str> in the [init-args] with the arg; + this implies -l, and hence processes one arg at a time +</code></pre> +<h2 id="example-4"><a class="header" href="#example-4">Example</a></h2> +<p>Collect arguments and prefix them with another option.</p> +<pre><code class="language-sh"># Using -l to process one arg at a time. +eval strace -f (find /dev -name 'std*' | xargs -l echo -P | xargs) ls + +# Using -I to place the arg at the specified location. +eval strace -f (find /dev -name 'std*' | xargs -I {} echo -P {}) ls + +# Both commands achieve the same thing and result in something like: +# eval strace -f -P /dev/stdin -P /dev/stdout -P /dev/stderr ls +</code></pre> <div style="break-before: page; page-break-before: always;"></div><h1 id="tools"><a class="header" href="#tools">Tools</a></h1> <ul> <li><a href="tools/./tmux.html">tmux</a></li> @@ -1829,6 +1848,15 @@ supports <code>fido-vertical-mode</code> in case vertical mode is preferred.</p> Info-history open info history in buffer </code></pre> +<h2 id="shell-commands"><a class="header" href="#shell-commands">shell commands</a></h2> +<pre><code class="language-markdown"> key fn description +--------------------------------------------- + M-! shell-command run shell command synchronously + M-& async-shell-command run shell command asynchronously + M-| shell-command-on-region run shell command on region; + prefix with C-u to replace region with + output of the command +</code></pre> <div style="break-before: page; page-break-before: always;"></div><h1 id="gpg1"><a class="header" href="#gpg1">gpg(1)</a></h1> <pre><code>gpg -o|--output Specify output file @@ -2653,7 +2681,7 @@ taskset -ac 0-2,4 CMD [ARGS] # Pin all tasks of running PID onto cores 0,2,4. taskset -ac 0-5:2 -p PID </code></pre> -<h3 id="example-4"><a class="header" href="#example-4">Example</a></h3> +<h3 id="example-5"><a class="header" href="#example-5">Example</a></h3> <p>Utility script to extract cpu lists grouped by the last-level-cache.</p> <pre><code class="language-python">import subprocess @@ -2760,13 +2788,18 @@ renice -n 5 -p PID -o <file> ... log output into <file> -l <filter> . show who calls into lib matched by <filter> -C .......... demangle + -e <filter> . show calls symbols matched by <filter> -x <filter> . which symbol table entry points to trace (can be of form sym_pattern@lib_pattern) + -n <num> number of spaces to indent nested calls </code></pre> -<h1 id="example-5"><a class="header" href="#example-5">Example</a></h1> +<h1 id="example-6"><a class="header" href="#example-6">Example</a></h1> <p>List which program/libs call into <code>libstdc++</code>:</p> <pre><code class="language-bash">ltrace -l '*libstdc++*' -C -o ltrace.log ./main </code></pre> +<p>List calls to specific symbols:</p> +<pre><code class="language-bash">ltrace -e malloc -e free ./main +</code></pre> <p>Trace symbols from <code>dlopen(3)</code>ed libraries.</p> <pre><code class="language-bash"># Assume libfoo.so would be dynamically loaded via dlopen. ltrace -x '@libfoo.so' @@ -3280,7 +3313,7 @@ thread name <name> or stepping. off: (default) Resume only threads of current process (inferior). </code></pre> -<h2 id="shell-commands"><a class="header" href="#shell-commands">Shell commands</a></h2> +<h2 id="shell-commands-1"><a class="header" href="#shell-commands-1">Shell commands</a></h2> <pre><code class="language-markdown"> shell <shell_cmd> Run the shell_cmd and print the output, can also contain a pipeline. @@ -3525,7 +3558,7 @@ New value = 3 set (s=0x7fffffffe594, v=3) at test.c:5 5 } </code></pre> -<h2 id="shell-commands-1"><a class="header" href="#shell-commands-1">Shell commands</a></h2> +<h2 id="shell-commands-2"><a class="header" href="#shell-commands-2">Shell commands</a></h2> <pre><code class="language-markdown"># Run shell commands. (gdb) shell zcat /proc/config.gz | grep CONFIG_KVM= @@ -3595,7 +3628,7 @@ $MOOSE=moose host:port tty </code></pre> -<h2 id="example-6"><a class="header" href="#example-6">Example</a></h2> +<h2 id="example-7"><a class="header" href="#example-7">Example</a></h2> <pre><code class="language-markdown"># Start gdbserver. gdbserver localhost:1234 /bin/ls @@ -5860,7 +5893,7 @@ link time <code>-lgcov</code>.</p> generated for a single file for example such as</p> <pre><code class="language-shell">gcov <SRC FILE | OBJ FILE> </code></pre> -<h2 id="example-7"><a class="header" href="#example-7">Example</a></h2> +<h2 id="example-8"><a class="header" href="#example-8">Example</a></h2> <pre><code class="language-cpp">#include <cstdio> void tell_me(int desc) { @@ -6766,7 +6799,7 @@ cpupower -c all frequency-info -g # Change frequency governor to POWERSAVE (eg). cpupower -c all frequency-set -g powersave </code></pre> -<h2 id="example-8"><a class="header" href="#example-8">Example</a></h2> +<h2 id="example-9"><a class="header" href="#example-9">Example</a></h2> <p>Watch cpu frequency.</p> <pre><code class="language-sh">watch -n1 "cpupower -c all frequency-info -f -m | xargs -n2 -d'\n'" </code></pre> @@ -6789,12 +6822,14 @@ lpadmin -x PRINTER <h2 id="printer--printing-options"><a class="header" href="#printer--printing-options">Printer & Printing options</a></h2> <pre><code class="language-sh"># List printer options. # CHECK printer-make-and-model -lpoptions -p Brother_MFC_L2750DW_series +lpoptions -p PRINTER # List printing options. -lpoptions -p Brother_MFC_L2750DW_series -l +lpoptions -p PRINTER -l +# Set an options, eg duplex mode. +lpoptions -p PRINTER -o 'Duplex=DuplexNoTumble # Set the default printer (stored in ~/.cups/lpoptions). -lpoptions -d Brother_MFC_L2750DW_series +lpoptions -d PRINTER </code></pre> <h2 id="inspect-installed-printer"><a class="header" href="#inspect-installed-printer">Inspect installed printer.</a></h2> <pre><code class="language-sh"># List default printer. @@ -6879,7 +6914,7 @@ locally and <code>-R</code> means that requests are issued remotely.</p> drop into shell)</li> <li><code>-f</code> run <code>ssh</code> command in the background</li> </ul> -<h3 id="example-9"><a class="header" href="#example-9">Example</a></h3> +<h3 id="example-10"><a class="header" href="#example-10">Example</a></h3> <pre><code class="language-sh"># Forward requests on localhost:8080 to moose:1234 and keep ssh in forground # but dont drop into a shell. ssh -N -L 8080:1234 moose |