将模式打印成单个awk或sed命令的优雅方式

时间：2018-02-23 05:53:52

标签： awk sed

我正在寻找一个模式，并希望从搜索模式打印第一行，尽管我可以通过sed＆amp; awk但是寻找一个短路的衬垫，我尝试了两种方式，产生了整个输出.. 

# dmidecode | awk 'NR == 1 || /Product/'
# dmidecode 3.0
        Product Name: SYS-749P-TR
        Product Name: X11DPi-N
        Product Name: SYS-7049P-TR
        Product Name: X11DPi-N

第二

# dmidecode | awk '/Product/ || NR == 1'
# dmidecode 3.0
        Product Name: SYS-749P-TR
        Product Name: X11DPi-N
        Product Name: SYS-7049P-TR
        Product Name: X11DPi-N

使用多管道方式时，它可以正常工作。

# dmidecode | awk '/Product/' | awk 'NR==1{print $3}'
Product Name: SYS-749P-TR

# dmidecode | grep Product | sed -n 1p
Product Name: SYS-749P-TR

2 个答案:

答案 0 :(得分：1)

请尝试以下一次，如果有帮助请告诉我：

awk 'FNR == 1 || (/Product/ && ++count==1)'  Input_file

解决方案第二： 只有在您想要查找第一次出现的Product以及Input_file的第一行时，才会出现Input_file然后以下内容可以帮助您。

awk 'FNR == 1 || /Product/{print;exit}'  Input_file

答案 1 :(得分：1)

如果我理解正确，您希望在包含22-Feb-2018 22:07:02.632 INFO [localhost-startStop-1] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time. 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/etc/pki/java/cacerts trustStore type is : jks trustStore provider is : init truststore ... a bunch of "adding as trusted cert" ... keyStore is : keyStore type is : jks keyStore provider is : init keystore init keymanager of type SunX509 trigger seeding of SecureRandom done seeding SecureRandom Allow unsafe renegotiation: false Allow legacy hello messages: true Is initial handshake: true Is secure renegotiation: false pool-1-thread-2, setSoTimeout(15000) called pool-1-thread-2, the previous server name in SNI (type=host_name (0), value=www.wta.org) was replaced with (type=host_name (0), value=www.wta.org) Ignoring unsupported cipher suite: TLS_RSA_WITH_AES_256_CBC_SHA256 for TLSv1 Ignoring unsupported cipher suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 for TLSv1 Ignoring unsupported cipher suite: TLS_DHE_DSS_WITH_AES_256_CBC_SHA256 for TLSv1 Ignoring unsupported cipher suite: TLS_RSA_WITH_AES_256_CBC_SHA256 for TLSv1.1 Ignoring unsupported cipher suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 for TLSv1.1 Ignoring unsupported cipher suite: TLS_DHE_DSS_WITH_AES_256_CBC_SHA256 for TLSv1.1 %% No cached client session *** ClientHello, TLSv1.2 RandomCookie: GMT: 1502523033 bytes = { 53, 17, 44, 60, 223, 247, 43, 100, 70, 139, 96, 93, 171, 101, 44, 228, 62, 27, 106, 57, 23, 205, 135, 35, 20, 69, 197, 176 } Session ID: {} Cipher Suites: [TLS_RSA_WITH_AES_256_CBC_SHA256, TLS_DHE_RSA_WITH_AES_256_CBC_SHA256, TLS_DHE_DSS_WITH_AES_256_CBC_SHA256, TLS_RSA_WITH_AES_256_CBC_SHA, TLS_DHE_RSA_WITH_AES_256_CBC_SHA, TLS_DHE_DSS_WITH_AES_256_CBC_SHA, TLS_RSA_WITH_AES_128_CBC_SHA256, TLS_DHE_RSA_WITH_AES_128_CBC_SHA256, TLS_DHE_DSS_WITH_AES_128_CBC_SHA256, TLS_RSA_WITH_AES_128_CBC_SHA, TLS_DHE_RSA_WITH_AES_128_CBC_SHA, TLS_DHE_DSS_WITH_AES_128_CBC_SHA, TLS_RSA_WITH_AES_256_GCM_SHA384, TLS_DHE_RSA_WITH_AES_256_GCM_SHA384, TLS_DHE_DSS_WITH_AES_256_GCM_SHA384, TLS_RSA_WITH_AES_128_GCM_SHA256, TLS_DHE_RSA_WITH_AES_128_GCM_SHA256, TLS_DHE_DSS_WITH_AES_128_GCM_SHA256, SSL_RSA_WITH_3DES_EDE_CBC_SHA, SSL_DHE_RSA_WITH_3DES_EDE_CBC_SHA, SSL_DHE_DSS_WITH_3DES_EDE_CBC_SHA, TLS_EMPTY_RENEGOTIATION_INFO_SCSV] Compression Methods: { 0 } Extension signature_algorithms, signature_algorithms: SHA512withECDSA, SHA512withRSA, SHA384withECDSA, SHA384withRSA, SHA256withECDSA, SHA256withRSA, SHA256withDSA, SHA224withECDSA, SHA224withRSA, SHA224withDSA, SHA1withECDSA, SHA1withRSA, SHA1withDSA, MD5withRSA Extension server_name, server_name: [type=host_name (0), value=www.wta.org] *** [write] MD5 and SHA1 hashes: len = 143 0000: 01 00 00 8B 03 03 5A 8F AF 99 35 11 2C 3C DF F7 ......Z...5.,<.. 0010: 2B 64 46 8B 60 5D AB 65 2C E4 3E 1B 6A 39 17 CD +dF.`].e,.>.j9.. 0020: 87 23 14 45 C5 B0 00 00 2C 00 3D 00 6B 00 6A 00 .#.E....,.=.k.j. 0030: 35 00 39 00 38 00 3C 00 67 00 40 00 2F 00 33 00 5.9.8.<.g.@./.3. 0040: 32 00 9D 00 9F 00 A3 00 9C 00 9E 00 A2 00 0A 00 2............... 0050: 16 00 13 00 FF 01 00 00 36 00 0D 00 1E 00 1C 06 ........6....... 0060: 03 06 01 05 03 05 01 04 03 04 01 04 02 03 03 03 ................ 0070: 01 03 02 02 03 02 01 02 02 01 01 00 00 00 10 00 ................ 0080: 0E 00 00 0B 77 77 77 2E 77 74 61 2E 6F 72 67 ....www.wta.org pool-1-thread-2, WRITE: TLSv1.2 Handshake, length = 143 [Raw write]: length = 148 0000: 16 03 03 00 8F 01 00 00 8B 03 03 5A 8F AF 99 35 ...........Z...5 0010: 11 2C 3C DF F7 2B 64 46 8B 60 5D AB 65 2C E4 3E .,<..+dF.`].e,.> 0020: 1B 6A 39 17 CD 87 23 14 45 C5 B0 00 00 2C 00 3D .j9...#.E....,.= 0030: 00 6B 00 6A 00 35 00 39 00 38 00 3C 00 67 00 40 .k.j.5.9.8.<.g.@ 0040: 00 2F 00 33 00 32 00 9D 00 9F 00 A3 00 9C 00 9E ./.3.2.......... 0050: 00 A2 00 0A 00 16 00 13 00 FF 01 00 00 36 00 0D .............6.. 0060: 00 1E 00 1C 06 03 06 01 05 03 05 01 04 03 04 01 ................ 0070: 04 02 03 03 03 01 03 02 02 03 02 01 02 02 01 01 ................ 0080: 00 00 00 10 00 0E 00 00 0B 77 77 77 2E 77 74 61 .........www.wta 0090: 2E 6F 72 67 .org [Raw read]: length = 5 0000: 15 03 03 00 02 ..... [Raw read]: length = 2 0000: 02 28 .( pool-1-thread-2, READ: TLSv1.2 Alert, length = 2 pool-1-thread-2, RECV TLSv1.2 ALERT: fatal, handshake_failure pool-1-thread-2, called closeSocket() pool-1-thread-2, handling exception: javax.net.ssl.SSLHandshakeException: Received fatal alert: handshake_failure pool-1-thread-2, called close() pool-1-thread-2, called closeInternal(true) 的第一行打印第三个字段。如果是这种情况，请尝试：

-Djavax.net.debug=all
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