'shell' 태그의 글 목록

2009. 10. 30. 15:41 Unix/Shell

unzip으로 특정 파일 추출하기.

* 리스트 확인

bash-2.03# unzip -l 142397-01.zip
Archive: 142397-01.zip
Length    Date    Time    Name
------    ----    ----    ----
      0 10-23-09 00:09   142397-01/
     76 07-21-09 07:13   142397-01/.diPatch
    214 07-21-09 07:13   142397-01/patchinfo
   2664 10-23-09 00:09   142397-01/README.142397-01
      0 07-21-09 07:57   142397-01/SUNWlibsasl/
      0 07-21-09 07:57   142397-01/SUNWlibsasl/reloc/
      0 07-21-09 07:57   142397-01/SUNWlibsasl/reloc/usr/
      0 07-21-09 07:57   142397-01/SUNWlibsasl/reloc/usr/lib/
      0 07-21-09 07:57   142397-01/SUNWlibsasl/reloc/usr/lib/sparcv9/
129680 07-21-09 07:41   142397-01/SUNWlibsasl/reloc/usr/lib/sparcv9/libsasl.so.1
113152 07-21-09 07:41   142397-01/SUNWlibsasl/reloc/usr/lib/libsasl.so.1
    560 07-21-09 07:57   142397-01/SUNWlibsasl/pkginfo
    627 07-21-09 07:57   142397-01/SUNWlibsasl/pkgmap
      0 07-21-09 07:57   142397-01/SUNWlibsasl/install/
    565 07-21-09 07:13   142397-01/SUNWlibsasl/install/patch_preinstall
12100 07-21-09 07:13   142397-01/SUNWlibsasl/install/postinstall
   4300 07-21-09 07:13   142397-01/SUNWlibsasl/install/patch_postinstall
   8023 07-21-09 07:13   142397-01/SUNWlibsasl/install/preinstall
   2044 07-21-09 07:13   142397-01/SUNWlibsasl/install/patch_checkinstall
   4104 07-21-09 07:13   142397-01/SUNWlibsasl/install/u.none
   7102 07-21-09 07:13   142397-01/SUNWlibsasl/install/i.none
   3426 07-21-09 07:13   142397-01/SUNWlibsasl/install/copyright
   6488 07-21-09 07:13   142397-01/SUNWlibsasl/install/checkinstall
18488 06-03-09 04:12   142397-01/LEGAL_LICENSE.TXT
------                    -------
313613                    24 files

* 파일 추출
bash-2.03# unzip 142397-01.zip 142397-01/README.142397-01
Archive: 142397-01.zip
inflating: 142397-01/README.142397-01
bash-2.03#

Posted by She쥐포s

2009. 2. 9. 20:51 Unix

[UnixTip] 쉘에서의 산술 비교

Unix 쉘에서의 산술 비교

Unix 쉘에서의 산술 비교는 정수값에 한정되어 있다. 다음은 기본적인
쉘 명령을 사용하여 부동 소수값을 비교하는 팁이다.

--------- CUT HERE-----------------
#! /bin/sh
# test shell script
n1="01.401"
n2="01.350"

function compareFloatSmall
{
sort -n <<: | head -1
$n1
$n2
:
}

function compareFloatGreat
{
sort -r -n <<: | head -1
$n1
$n2
:
}

small=$(compareFloatSmall $n1 $n2)
echo "Comparing $n1 to $n2: smaller $less"
great=$(compareFloatGreat $n1 $n2)
echo "Comparing $n1 to $n2: greater $great"
--------- CUT HERE-----------------

다른 방법으로 'awk' 프로그램을 사용할 수 있다.
--------- CUT AGAIN HERE-----------
#! /bin/sh
# A couple of examples in awk.
n1="03.550"
n2="02.550"

echo "$n1 $n2" | awk '{
       if ( $1 >= $2 ) print $1
       if ( $1 <= $2 ) print $2
       if ( $1 > $2 ) print $1
       if ( $1 < $2 ) print $2
       if ( $1 == $2 ) print $1, $2
}'
--------- CUT AGAIN HERE-----------

<><><><><><><><><><>원 문<><><><><><><><><><><>
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

UNIX GURU UNIVERSE
UNIX HOT TIP

Unix Tip 2926 - February 9, 2009

http://www.ugu.com/sui/ugu/show?tip.today

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

ARITHMETIC COMPARISON

In UNIX shell arithmetic comparison
is limited to integer values. Here
is a tip to compare floating values
using basic shell commands.

--------- CUT HERE-----------------

#! /bin/sh
# test shell script
n1="01.401"
n2="01.350"

function compareFloatSmall
{
sort -n <<: | head -1
$n1
$n2
:
}

function compareFloatGreat
{
sort -r -n <<: | head -1
$n1
$n2
:
}

small=$(compareFloatSmall $n1 $n2)
echo "Comparing $n1 to $n2: smaller $less"
great=$(compareFloatGreat $n1 $n2)
echo "Comparing $n1 to $n2: greater $great"

--------- CUT HERE-----------------

Alternatively you can use a small 'awk' program.

--------- CUT AGAIN HERE-----------
#! /bin/sh
# A couple of examples in awk.
n1="03.550"
n2="02.550"

echo "$n1 $n2" | awk '{
       if ( $1 >= $2 ) print $1
       if ( $1 <= $2 ) print $2
       if ( $1 > $2 ) print $1
       if ( $1 < $2 ) print $2
       if ( $1 == $2 ) print $1, $2
}'
--------- CUT AGAIN HERE-----------

Posted by She쥐포s

2008. 9. 21. 17:47 Unix/Shell

null copy

○ null copy
File의 Size를 0으로 만드는 작업으로 일반적으로 로그파일이 커졌을 때 해당 파일의 사이즈를 초기화하는 목적
등으로 사용됨.

○ 방법
        1. cat /dev/null > FILENAME
                 /dev/null 파일을 직접 파일에 Redirection한다.
                일반적인 경우 사용됨.
                 예)
                    # cat /dev/null > /var/log/messages

        2. > FILENAME
                직접 Redirection해서 파일에 쓴다.
                Bourne Shell, Korn Shell에서 사용됨
                예)

                    # > /var/log/messages

참고 원문
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
                             UNIX GURU UNIVERSE
                                UNIX HOT TIP

                       Unix Tip 3151 - September 21, 2008

                   http://www.ugu.com/sui/ugu/show?tip.today

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

NULL IT FAST

Here is the fastest way to truncate a file to zero
bytes in a bourne or korn shell.

$ > /var/log/messages

This is a good method, if the file has to be truncated,
but is opened by another process. For example, if you
want to truncate /var/log/messages, which is held
open by syslogd...