1. tcpdump
   1. 参数简介
   2. 示例
      1. tcpdump -nqX -i any -s 0 'port 80 && len >= 52'
      2. tcpdump -i eth0 -s 0 'port 13132' -q -e -XX -vv | egrep --color -C 8 "[12]000 3701|[12]000 3502"
      3. tcpdump -i eth0 -s 0 'port 8027' -q -e -XX -vv | egrep --color -C 8 "[12]000 3701|[12]000 3502"
2. oracle
   1. sqldr
      1. 命令
      2. ctl文件
      3. csv文件
   2. sqlplus
      1. sqlplus '/as sysdba'
         1. shutdown immediate
      2. sqlplus opd_erating_yb/opdyb
   3. rman
      1. $rman target / run { delete noprompt obsolete; crosscheck backup; delete noprompt expired backup; crosscheck archivelog all; delete noprompt expired archivelog all; delete noprompt archivelog all completed before 'SYSDATE - 7'; }
   4. alter user username account unlock;
3. vim
   1. 折叠 Z(fold)
      1. 将选中折叠 zf
      2. 删除折叠 zd
      3. 禁止但不删除当前buf的所有折叠 zi
      4. 打开所在折叠 zo
      5. 关闭所在折叠 zc
   2. c-hotkeys
      1. 函数注释
         1. ;cfu
   3. diff
      1. do
         1. diff obtain
            1. 将另一窗口的差异合并到本窗口
      2. dp
         1. diff put
            1. 将差异从本窗口合并到另一窗口
      3. [c
         1. 跳到上一个差异处
      4. ]c
         1. 调到下一差异处
4. openssl
   1. SYNOPSIS
      1. openssl command [ command_opts ] [ command_args ]
      2. openssl [ list-standard-commands │ list-message-digest-commands │ list-cipher-commands ]
      3. openssl no-XXX [ arbitrary options ]
   2. openssl xxx
      1. openssl_01.png
   3. base64
      1. echo -n abc | openssl base64
      2. echo -n abc | openssl base64 -e
      3. echo YWJj | openssl base64 -d
      4. 等价
   4. aes
      1. $ echo -n "abc" | openssl aes-128-ecb -e -k 123 -nosalt -base64 naU3gm+GUolTb1SZkSY1Gg==
      2. $ echo "naU3gm+GUolTb1SZkSY1Gg==" | openssl aes-128-ecb -d -k 123 -nosalt -base64 abc
      3. $ echo -n "ABCDEFGHIJKLMNO" | openssl aes-128-ecb -e -K 41 -iv abcdddd -nosalt -p -base64 key=41000000000000000000000000000000 iv =ABCDDDD0000000000000000000000000 RVSOzrtYlXuqScr+Q5/VhA==
      4. $ echo "RVSOzrtYlXuqScr+Q5/VhA==" | openssl aes-128-ecb -d -K 41 -iv abcdddd -nosalt -p -base64 key=41000000000000000000000000000000 iv =ABCDDDD0000000000000000000000000 ABCDEFGHIJKLMNO
5. echo
   1. echo abc
   2. echo "abc"
   3. echo $HOME
   4. echo $LD_LIBRARY_PATH
   5. echo -n "abc"
6. tee
   1. ls -al | tee poop.out
7. tail
8. awk
   1. tl | grep -v "|-145|" | awk -F"|" '{result = $8; if (result != 1) print;}'
   2. cat 2009-12-05_1[8]*.log | grep -a JointAuth | awk -F"[| ,=]" 'BEGIN{cnt_all = 0; tc = 0;}{cnt_all += 1; tc += $NF; all[substr($1, 1, 16)] += 1; if ($8 == -202) {timeout[substr($1, 1, 16)] += 1;} else if ($8 == 1) {ok[substr($1, 1, 16)] += 1;}}END{printf "9累积请求数：\t%s\n", cnt_all; for (name in all) {printf "%-25s%-10s%-10s%-10s%-.2lf\n", name, all[name], ok[name], timeout[name], ok[name] / all[name];} printf "%-30s%-10s%-10s%-10s%-10s\n", "2时间（分）", "总请求", "成功", "超时", "成功率"; printf "9平均TC：\t%lf\n", tc / cnt_all;}' | sort
9. grep
10. expect
11. spawn
12. date
    1. date -d@1232143242
    2. date +%s
13. cut
    1. cut -b 1,3,5-7
    2. cut -c 1-8,15-
    3. cut -f 1,3
       1. -d指定的域分隔符默认为制表符
       2. cut -d : -f 1
       3. cut -d ' ' -f 6
    4. 如果文件里面的某些域是由若干个空格来间隔的， 那么用cut就有点麻烦了，因为cut只擅长处理 “以一个字符间隔”的文本内容。
14. tar
    1. tar zcvf base.tgz --exclude=*/.svn --exclude=.* --exclude=*.o --exclude=core.* --exclude=*/*.so* --exclude=*/*.a* base baseTest
15. paste
    1. paste file1 file2 file_union
16. date
    1. date +%s
    2. date +%s -d “2010-03-10 17:36:23″
17. gtest
    1. EXPECT_EQ(x[i], y[i]) << "Vectors x and y differ at index " << i;
    2. 输出参数值
       1. ASSERT_PRED1(pred1, val1);
       2. ASSERT_PRED2(pred2, val1, val2);
    3. 浮点数比较
       1. ASSERT_FLOAT_EQ(expected, actual);
       2. ASSERT_DOUBLE_EQ(expected, actual);
    4. 两个数差值判断
       1. ASSERT_NEAR(val1, val2, abs_error);
       2. EXPECT_NEAR(val1, val2, abs_error);
    5. 事件
       1. TestSuite
18. netstat
    1. netstat -tnlp
    2. while [[ 1 ]]; do date; netstat -ntp 2>/dev/null | egrep --color "Proto|709[1234]"; sleep 1; done
19. nmap
    1. nmap localhost
20. chkconfig
    1. 网页
       1. http://blog.csdn.net/youyu_buzai/archive/2009/03/04/3956845.aspx
       2. http://roclinux.cn/?p=51
       3. http://www.diybl.com/course/6_system/linux/Linuxjs/20090312/160795.html
       4. http://drupalsh.cn/Linux-apache-mysql-autostart
21. portmap
    1. 配置
    2. 示例
       1. /sbin/chkconfig --list portmap /sbin/chkconfig --level 35 portmap on /sbin/chkconfig --list portmap service portmap start
22. gdb
    1. print
       1. x 按十六进制格式显示变量。 d 按十进制格式显示变量。 u 按十六进制格式显示无符号整型。 o 按八进制格式显示变量。 t 按二进制格式显示变量。 a 按十六进制格式显示变量。 c 按字符格式显示变量。 f 按浮点数格式显示变量。
    2. break
       1. 查看断点
          1. info break
       2. 条件断点
          1. 语法
             1. reak line-or-function if expr
          2. 示例
             1. break 46 if testsize==100
23. 常用命令
    1. cat 707[34]/log/*_2009-12-2[56]_*.log | grep onJointAuth | cut -b 1-19 | sort | uniq -c | sort -t ' ' -k 1 -n
    2. vi `grep DF_GAME_ID *.pck | cut -d : -f 1 | sort | uniq`
    3. netstat -ntlp 2>/dev/null | grep --color `pgrep eRatingServer` | tr -s ' ' ' ' | awk -F"[ :]" '{print $5;}'
24. gcc
    1. 打开所有警告
       1. -Wall不能真正打开所有的警告，我采用由Bruce Evans推荐的参数 而且在FreeBSD环境下，BDECFLAGS变量比较固定。 # BDECFLAGS are a set of gcc warning settings that Bruce Evans has suggested # for use in developing FreeBSD and testing changes. They can be used by # putting "CFLAGS =${BDECFLAGS}" in /etc/make.conf. -Wconversion is not # included here due to compiler bugs, eg: mkdir()'s mode_t argument. # BDECFLAGS= -W -Wall -ansi -pedantic -Wbad-function-cast -Wcast-align \ -Wcast-qual -Wchar-subscripts -Winline \ -Wmissing-prototypes -Wnested-externs -Wpointer-arith \ -Wredundant-decls -Wshadow -Wstrict-prototypes -Wwrite-strings This set of flags is *much* pickier than -Wall alone. (From: W Gerald Hicks)
25. find
    1. find . -type f -maxdepth 2 -regex '\./[^/]+/[^/]*\.B[0-9][0-9][0-9][0-9][0-9]'
    2. find . -type f -maxdepth 2 -regex '\./[^/]+/[^/]*\.\(B[0-9][0-9][0-9][0-9][0-9]\|a\)'
    3. find . -type f -maxdepth 2 -regex '\./[^/]+/[^/]*\.\(B[0-9][0-9][0-9][0-9][0-9]\|a\|o\)'
    4. find . -name .svn -type d -print0 | xargs -0 rm -rf
26. tr
    1. 表示集合的符号
       1. [:alnum:] ：所有字母字符与数字
       2. [:alpha:] ：所有字母字符
       3. [:blank:] ：所有水平空格
       4. [:cntrl:] ：所有控制字符
       5. [:digit:] ：所有数字
       6. [:graph:] ：所有可打印的字符(不包含空格符)
       7. [:lower:] ：所有小写字母
       8. [:print:] ：所有可打印的字符(包含空格符)
       9. [:punct:] ：所有标点字符
       10. [:space:] ：所有水平与垂直空格符
       11. [:upper:] ：所有大写字母
       12. [:xdigit:] ：所有 16 进位制的数字
    2. 示例
       1. tr -s ‘ ‘ ‘ ‘ < spaces.txt
       2. tr -d ‘ ‘ < spaces.txt
       3. tr -d [0-9] < filename
       4. echo "abcd" | tr a-z A-Z
       5. cat filename|tr [:lower:] [:upper:]
       6. cat filename | tr -d abc
       7. tr ‘1-5′ ‘[A*]‘ < number.txt
       8. tr "\n\r" " "
       9. tr "\n\r" "\\\|"
       10. 删除指定字符
27. curl
    1. curl --trace-ascii - -d 'userid=12499643&username=4399%E5%B0%8F%E6%95%8F&time=1258682909&flag=35d5f447b76c85fc254023c0e5d2cf3d' 'http://web.4399.com/api/ftxy/passport.php'
    2. curl --trace - -H 'Transfer-Encoding: chunked' -d 'userid=12499643&username=4399%E5%B0%8F%E6%95%8F&time=1258682909&flag=35d5f447b76c85fc254023c0e5d2cf3d' 'http://web.4399.com/api/ftxy/passport.php'
    3. curl 5-ip.com | egrep '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}'
28. uname
    1. uname
    2. uname -m
29. sort
    1. -n 对数字排序
    2. -t 设置分隔符
    3. -k 指定域
    4. -o 指定输出文件
    5. http://roclinux.cn/?p=1350
30. sed
    1. 示例
       1. sed ‘/^[dD]/s/x/X/g’
       2. sed 's/ \+/ /g'
       3. sed ’s/\(Beijing\)\(.*\)\(Beijing\)/\12008\2\32008/’ mysed.txt
       4. sed -n ‘/2005/,/2007/p’ mysed.txt
       5. sed ‘/2005/r ins.txt’ mysed.txt
       6. sed ‘/200[4-6]/w new.txt’ mysed.txt
       7. sed ‘/2004/a\China’ mysed.txt
       8. sed ‘/2004/i\China’ mysed.txt
       9. sed ‘y/eijng/EIJNG/’ mysed.txt
       10. sed 's/ /\\\/'
       11. sed "s/EProtocol\>/&2/p" Makefile -n
           1. p
              1. 输出文件内容
           2. -n
              1. 不输出未匹配的行
           3. -i
              1. 直接在文件中（Makefile）进行替换操作
       12. sed '/2004/{n;y/eijng/EIJNG/;}' mysed.txt
       13. sed ‘/200/{n;y/eijng/EIJNG/;}’ mysed.txt
       14. 对匹配行的下一行进行处理
    2. sed "/objects/s:.*:objects = $\(basename $\(shell ls $\(SRCDIR\)/*.cpp \| awk -F / '{print \$\$NF}')):" gssim_agip2/Makefile -i `find . -name Makefile -mindepth 2`
31. 自定义
    1. 别名
       1. grep='grep -a --color '
       2. hi='history | less +G'
    2. 函数
       1. fn
          1. 介绍
          2. 实现
          3. 用法
             1. fn <分隔符> <记录内容>
             2. fn '|=, ' 'abc| =,df'
       2. tl
       3. lf
    3. 脚本
32. svn
    1. svn cp trunk branch -m 'commit message'
    2. svn log --stop-on-copy
    3. svn merge -r rev:HEAD svn://branches
33. watch
    1. execute a program periodically, showing output fullscreen
    2. 参数
       1. -n（--interval）
          1. 指定重复周期，单位秒
       2. -d
          1. 高亮显示本次输出和上次不同的内容
34. nc
    1. arbitrary TCP and UDP connections and listens
    2. 参数
       1. -w
          1. nc -w 5 127.0.0.1 1234
35. SQL
    1. rank() over(partition by u.user_id order by r.role_level desc) num
    2. to_char(trunc(t.log_time), 'yyyy-mm-dd')
36. join
    1. -v 1
       1. 显示1文件比2文件多的内容
    2. -v 2
       1. 显示2文件比1文件多的内容
37. diff
    1. -u
       1. 以标准格式显示差异
38. getopt
    1. $ getopt -s bash -aq -o "a:" -l "bb:" -- /wangxf "--bb=abc" "-a" "aaa" "-bb=ddd" /hom