bash FAQ

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  • pstree

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    straysh ~]$ps -ef|grep nginx
    root      7342  1962  0 10:11 ?        00:00:00 nginx: master process nginx
    www       7343  7342  0 10:11 ?        00:00:00 nginx: worker process
    www       7344  7342  0 10:11 ?        00:00:00 nginx: worker process
    www       7345  7342  0 10:11 ?        00:00:00 nginx: worker process
    www       7346  7342  0 10:11 ?        00:00:00 nginx: worker process
    www       7347  7342  0 10:11 ?        00:00:00 nginx: worker process
    www       7348  7342  0 10:11 ?        00:00:00 nginx: worker process
    www       7349  7342  0 10:11 ?        00:00:00 nginx: worker process
    www       7350  7342  0 10:11 ?        00:00:00 nginx: worker process
    straysh   7595  7328  0 10:17 pts/4    00:00:00 grep --color=auto nginx
    straysh ~]$pstree -ph 7342
    nginx(7342)─┬─nginx(7343)
                ├─nginx(7344)
                ├─nginx(7345)
                ├─nginx(7346)
                ├─nginx(7347)
                ├─nginx(7348)
                ├─nginx(7349)
                └─nginx(7350)

  • ps 

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    straysh ~]$ps -Lf 1656
    UID        PID  PPID   LWP  C NLWP STIME TTY      STAT   TIME CMD
    root      1656     1  1656  0    1 08:52 ?        Ss     0:00 /usr/sbin/apache2 -k start

  • pstack

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    $ pstack 4551
    Thread 7 (Thread 1084229984 (LWP 4552)):
    #0  0x000000302afc63dc in epoll_wait () from /lib64/tls/libc.so.6
    #1  0x00000000006f0730 in ub::EPollEx::poll ()
    #2  0x00000000006f172a in ub::NetReactor::callback ()
    #3  0x00000000006fbbbb in ub::UBTask::CALLBACK ()
    #4  0x000000302b80610a in start_thread () from /lib64/tls/libpthread.so.0
    #5  0x000000302afc6003 in clone () from /lib64/tls/libc.so.6
    #6  0x0000000000000000 in ?? ()

  • find and mv

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    find cache_bak/ -type f |xargs -i mv '{}' cache/

  • quick delete files

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    find . -type f -d

  • 重命名文件

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    rename -v 's/1_//' *.html

  • 去除重复的行

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    awk '!x[$0]++' 8.txt > 8_no_dup.txt

  • 删除文件

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    find . -type f -exec grep -H '您要查看的商户不存在' {} \; -delete

  • 从文本中匹配特定的字符串

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    curl -s "http://www.baidu.com/s?ie=utf-8&f=8&rsv_bp=0&rsv_idx=1&tn=baidu&wd=热干面&rsv_pq=bd5722370004bbe0&rsv_t=5d19sLQJWuSZFFDWWaH%2Bd%2BVzn9pzgmbLu23Z%2FnUrfAjj%2FaEyTSFswdcEbX0&rsv_enter=1&rsv_sug3=12&rsv_sug1=2&rsv_sug2=0&inputT=3330&rsv_sug4=3628" | sed -nr 's/.*百度为您找到相关结果约(.*)个.*/\1/p'

  • 字符串替换

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    #http://tldp.org/LDP/abs/html/string-manipulation.html
    result=1,280,000
    result=${result//,/}
    echo ${result} #1280000

Straysh野生程序猿

野生程序猿 & 猫奴。