cut 或 awk 命令打印第一行的第一个字段

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cut or awk command to print first field of first row

我正在尝试打印输出第一行的第一个字段。情况就是这样。我只需要从此输出中打印 SUSE 。

# cat /etc/*release



SUSE Linux Enterprise Server 11 (x86_64)

VERSION = 11

PATCHLEVEL = 2
SUSE

VERSION

PATCHLEVEL
awk 'NR==1{print $1}' /etc/*release
awk '{print $1; exit}'

awk 'NR==42{print $1; exit}'

awk 'NR==1{print $1}' /etc/*release
head -1 /etc/*release | awk '{print $1}'

head -n1 /etc/*release | awk '{print $1}'

df -h | head -4 | tail -1 | awk '{ print $2 }'

sed -n 1p /etc/*release |cut -d"" -f1

sed -n 1p /etc/*release |cut -f1

set `cat /etc/*release`; echo $1

sed 'NUMq;d' /etc/*release | awk {'print $1}'
ex. sed '1q;d' /etc/*release | awk {'print $1}'

ps -aux | grep $(docker ps -a | grep container-name | awk '{print $1}')

尝试使用 cat /etc/*release | awk {'print $1}' 但打印每一行的第一个字符串

# cat /etc/*release



SUSE Linux Enterprise Server 11 (x86_64)

VERSION = 11

PATCHLEVEL = 2
SUSE

VERSION

PATCHLEVEL
awk 'NR==1{print $1}' /etc/*release
awk '{print $1; exit}'

awk 'NR==42{print $1; exit}'

awk 'NR==1{print $1}' /etc/*release
head -1 /etc/*release | awk '{print $1}'

head -n1 /etc/*release | awk '{print $1}'

df -h | head -4 | tail -1 | awk '{ print $2 }'

sed -n 1p /etc/*release |cut -d"" -f1

sed -n 1p /etc/*release |cut -f1

set `cat /etc/*release`; echo $1

sed 'NUMq;d' /etc/*release | awk {'print $1}'
ex. sed '1q;d' /etc/*release | awk {'print $1}'

ps -aux | grep $(docker ps -a | grep container-name | awk '{print $1}')

如果要从选定行捕获输出，请指定 NR：

# cat /etc/*release



SUSE Linux Enterprise Server 11 (x86_64)

VERSION = 11

PATCHLEVEL = 2
SUSE

VERSION

PATCHLEVEL
awk 'NR==1{print $1}' /etc/*release
awk '{print $1; exit}'

awk 'NR==42{print $1; exit}'

awk 'NR==1{print $1}' /etc/*release
head -1 /etc/*release | awk '{print $1}'

head -n1 /etc/*release | awk '{print $1}'

df -h | head -4 | tail -1 | awk '{ print $2 }'

sed -n 1p /etc/*release |cut -d"" -f1

sed -n 1p /etc/*release |cut -f1

set `cat /etc/*release`; echo $1

sed 'NUMq;d' /etc/*release | awk {'print $1}'
ex. sed '1q;d' /etc/*release | awk {'print $1}'

ps -aux | grep $(docker ps -a | grep container-name | awk '{print $1}')

实现相同目的的另一种(丑陋)方法是：

# cat /etc/*release



SUSE Linux Enterprise Server 11 (x86_64)

VERSION = 11

PATCHLEVEL = 2
SUSE

VERSION

PATCHLEVEL
awk 'NR==1{print $1}' /etc/*release
awk '{print $1; exit}'

awk 'NR==42{print $1; exit}'

awk 'NR==1{print $1}' /etc/*release
head -1 /etc/*release | awk '{print $1}'

head -n1 /etc/*release | awk '{print $1}'

df -h | head -4 | tail -1 | awk '{ print $2 }'

sed -n 1p /etc/*release |cut -d"" -f1

sed -n 1p /etc/*release |cut -f1

set `cat /etc/*release`; echo $1

sed 'NUMq;d' /etc/*release | awk {'print $1}'
ex. sed '1q;d' /etc/*release | awk {'print $1}'

ps -aux | grep $(docker ps -a | grep container-name | awk '{print $1}')

在输出中从特定行(例如第 42 行)获取第一个字符串的有效方法是：

# cat /etc/*release



SUSE Linux Enterprise Server 11 (x86_64)

VERSION = 11

PATCHLEVEL = 2
SUSE

VERSION

PATCHLEVEL
awk 'NR==1{print $1}' /etc/*release
awk '{print $1; exit}'

awk 'NR==42{print $1; exit}'

awk 'NR==1{print $1}' /etc/*release
head -1 /etc/*release | awk '{print $1}'

head -n1 /etc/*release | awk '{print $1}'

df -h | head -4 | tail -1 | awk '{ print $2 }'

sed -n 1p /etc/*release |cut -d"" -f1

sed -n 1p /etc/*release |cut -f1

set `cat /etc/*release`; echo $1

sed 'NUMq;d' /etc/*release | awk {'print $1}'
ex. sed '1q;d' /etc/*release | awk {'print $1}'

ps -aux | grep $(docker ps -a | grep container-name | awk '{print $1}')

使用 NR 内置变量指定行号。

# cat /etc/*release



SUSE Linux Enterprise Server 11 (x86_64)

VERSION = 11

PATCHLEVEL = 2
SUSE

VERSION

PATCHLEVEL
awk 'NR==1{print $1}' /etc/*release
awk '{print $1; exit}'

awk 'NR==42{print $1; exit}'

awk 'NR==1{print $1}' /etc/*release
head -1 /etc/*release | awk '{print $1}'

head -n1 /etc/*release | awk '{print $1}'

df -h | head -4 | tail -1 | awk '{ print $2 }'

sed -n 1p /etc/*release |cut -d"" -f1

sed -n 1p /etc/*release |cut -f1

set `cat /etc/*release`; echo $1

sed 'NUMq;d' /etc/*release | awk {'print $1}'
ex. sed '1q;d' /etc/*release | awk {'print $1}'

ps -aux | grep $(docker ps -a | grep container-name | awk '{print $1}')

试试这个：

# cat /etc/*release



SUSE Linux Enterprise Server 11 (x86_64)

VERSION = 11

PATCHLEVEL = 2
SUSE

VERSION

PATCHLEVEL
awk 'NR==1{print $1}' /etc/*release
awk '{print $1; exit}'

awk 'NR==42{print $1; exit}'

awk 'NR==1{print $1}' /etc/*release
head -1 /etc/*release | awk '{print $1}'

head -n1 /etc/*release | awk '{print $1}'

df -h | head -4 | tail -1 | awk '{ print $2 }'

sed -n 1p /etc/*release |cut -d"" -f1

sed -n 1p /etc/*release |cut -f1

set `cat /etc/*release`; echo $1

sed 'NUMq;d' /etc/*release | awk {'print $1}'
ex. sed '1q;d' /etc/*release | awk {'print $1}'

ps -aux | grep $(docker ps -a | grep container-name | awk '{print $1}')

你可以用 head 代替 cat:

# cat /etc/*release



SUSE Linux Enterprise Server 11 (x86_64)

VERSION = 11

PATCHLEVEL = 2
SUSE

VERSION

PATCHLEVEL
awk 'NR==1{print $1}' /etc/*release
awk '{print $1; exit}'

awk 'NR==42{print $1; exit}'

awk 'NR==1{print $1}' /etc/*release
head -1 /etc/*release | awk '{print $1}'

head -n1 /etc/*release | awk '{print $1}'

df -h | head -4 | tail -1 | awk '{ print $2 }'

sed -n 1p /etc/*release |cut -d"" -f1

sed -n 1p /etc/*release |cut -f1

set `cat /etc/*release`; echo $1

sed 'NUMq;d' /etc/*release | awk {'print $1}'
ex. sed '1q;d' /etc/*release | awk {'print $1}'

ps -aux | grep $(docker ps -a | grep container-name | awk '{print $1}')
# cat /etc/*release



SUSE Linux Enterprise Server 11 (x86_64)

VERSION = 11

PATCHLEVEL = 2
SUSE

VERSION

PATCHLEVEL
awk 'NR==1{print $1}' /etc/*release
awk '{print $1; exit}'

awk 'NR==42{print $1; exit}'

awk 'NR==1{print $1}' /etc/*release
head -1 /etc/*release | awk '{print $1}'

head -n1 /etc/*release | awk '{print $1}'

df -h | head -4 | tail -1 | awk '{ print $2 }'

sed -n 1p /etc/*release |cut -d"" -f1

sed -n 1p /etc/*release |cut -f1

set `cat /etc/*release`; echo $1

sed 'NUMq;d' /etc/*release | awk {'print $1}'
ex. sed '1q;d' /etc/*release | awk {'print $1}'

ps -aux | grep $(docker ps -a | grep container-name | awk '{print $1}')

更改数字以根据自己的喜好进行调整。

或者使用while循环，但这可能是一种不好的方法。

# cat /etc/*release



SUSE Linux Enterprise Server 11 (x86_64)

VERSION = 11

PATCHLEVEL = 2
SUSE

VERSION

PATCHLEVEL
awk 'NR==1{print $1}' /etc/*release
awk '{print $1; exit}'

awk 'NR==42{print $1; exit}'

awk 'NR==1{print $1}' /etc/*release
head -1 /etc/*release | awk '{print $1}'

head -n1 /etc/*release | awk '{print $1}'

df -h | head -4 | tail -1 | awk '{ print $2 }'

sed -n 1p /etc/*release |cut -d"" -f1

sed -n 1p /etc/*release |cut -f1

set `cat /etc/*release`; echo $1

sed 'NUMq;d' /etc/*release | awk {'print $1}'
ex. sed '1q;d' /etc/*release | awk {'print $1}'

ps -aux | grep $(docker ps -a | grep container-name | awk '{print $1}')

如果制表符分隔：

# cat /etc/*release



SUSE Linux Enterprise Server 11 (x86_64)

VERSION = 11

PATCHLEVEL = 2
SUSE

VERSION

PATCHLEVEL
awk 'NR==1{print $1}' /etc/*release
awk '{print $1; exit}'

awk 'NR==42{print $1; exit}'

awk 'NR==1{print $1}' /etc/*release
head -1 /etc/*release | awk '{print $1}'

head -n1 /etc/*release | awk '{print $1}'

df -h | head -4 | tail -1 | awk '{ print $2 }'

sed -n 1p /etc/*release |cut -d"" -f1

sed -n 1p /etc/*release |cut -f1

set `cat /etc/*release`; echo $1

sed 'NUMq;d' /etc/*release | awk {'print $1}'
ex. sed '1q;d' /etc/*release | awk {'print $1}'

ps -aux | grep $(docker ps -a | grep container-name | awk '{print $1}')

awk, sed, pipe, 太重了

# cat /etc/*release



SUSE Linux Enterprise Server 11 (x86_64)

VERSION = 11

PATCHLEVEL = 2
SUSE

VERSION

PATCHLEVEL
awk 'NR==1{print $1}' /etc/*release
awk '{print $1; exit}'

awk 'NR==42{print $1; exit}'

awk 'NR==1{print $1}' /etc/*release
head -1 /etc/*release | awk '{print $1}'

head -n1 /etc/*release | awk '{print $1}'

df -h | head -4 | tail -1 | awk '{ print $2 }'

sed -n 1p /etc/*release |cut -d"" -f1

sed -n 1p /etc/*release |cut -f1

set `cat /etc/*release`; echo $1

sed 'NUMq;d' /etc/*release | awk {'print $1}'
ex. sed '1q;d' /etc/*release | awk {'print $1}'

ps -aux | grep $(docker ps -a | grep container-name | awk '{print $1}')

试试

# cat /etc/*release



SUSE Linux Enterprise Server 11 (x86_64)

VERSION = 11

PATCHLEVEL = 2
SUSE

VERSION

PATCHLEVEL
awk 'NR==1{print $1}' /etc/*release
awk '{print $1; exit}'

awk 'NR==42{print $1; exit}'

awk 'NR==1{print $1}' /etc/*release
head -1 /etc/*release | awk '{print $1}'

head -n1 /etc/*release | awk '{print $1}'

df -h | head -4 | tail -1 | awk '{ print $2 }'

sed -n 1p /etc/*release |cut -d"" -f1

sed -n 1p /etc/*release |cut -f1

set `cat /etc/*release`; echo $1

sed 'NUMq;d' /etc/*release | awk {'print $1}'
ex. sed '1q;d' /etc/*release | awk {'print $1}'

ps -aux | grep $(docker ps -a | grep container-name | awk '{print $1}')

其中 NUM 是行号

# cat /etc/*release



SUSE Linux Enterprise Server 11 (x86_64)

VERSION = 11

PATCHLEVEL = 2
SUSE

VERSION

PATCHLEVEL
awk 'NR==1{print $1}' /etc/*release
awk '{print $1; exit}'

awk 'NR==42{print $1; exit}'

awk 'NR==1{print $1}' /etc/*release
head -1 /etc/*release | awk '{print $1}'

head -n1 /etc/*release | awk '{print $1}'

df -h | head -4 | tail -1 | awk '{ print $2 }'

sed -n 1p /etc/*release |cut -d"" -f1

sed -n 1p /etc/*release |cut -f1

set `cat /etc/*release`; echo $1

sed 'NUMq;d' /etc/*release | awk {'print $1}'
ex. sed '1q;d' /etc/*release | awk {'print $1}'

ps -aux | grep $(docker ps -a | grep container-name | awk '{print $1}')

你可以杀死正在运行容器的进程。

使用这个命令可以列出与docker容器相关的进程：

# cat /etc/*release



SUSE Linux Enterprise Server 11 (x86_64)

VERSION = 11

PATCHLEVEL = 2
SUSE

VERSION

PATCHLEVEL
awk 'NR==1{print $1}' /etc/*release
awk '{print $1; exit}'

awk 'NR==42{print $1; exit}'

awk 'NR==1{print $1}' /etc/*release
head -1 /etc/*release | awk '{print $1}'

head -n1 /etc/*release | awk '{print $1}'

df -h | head -4 | tail -1 | awk '{ print $2 }'

sed -n 1p /etc/*release |cut -d"" -f1

sed -n 1p /etc/*release |cut -f1

set `cat /etc/*release`; echo $1

sed 'NUMq;d' /etc/*release | awk {'print $1}'
ex. sed '1q;d' /etc/*release | awk {'print $1}'

ps -aux | grep $(docker ps -a | grep container-name | awk '{print $1}')

现在你有了用 kill 或 kill -9 杀死的进程 ID。

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