awk 的问题格雷普
我喜欢从 wmctrl 获取窗口 pid（仅 firefox），我尝试过 wmctrl -lp |火狐 | grep awk -F" " "{print $1}" 但输出与我的预期不符。请帮忙。
beer@beer-laptop# wmctrl -lp
0x0160001b -1 6504 beer-laptop x-nautilus-desktop
0x016000bd 0 6504 beer-laptop conference - File Browser
0x03e00003 0 0 N/A XBMC Media Center
0x03800081 0 7282 beer-laptop Xbmc_ConferenceWindow.py (~/.qlive/xbmc-conference) - gedit
0x0352f117 0 6963 beer-laptop Ask a Question - Stack Overflow - Chromium
0x01400040 -1 6503 beer-laptop Top Expanded Edge Panel
0x01400003 -1 6503 beer-laptop Bottom Expanded Edge Panel
0x03202deb 0 6866 beer-laptop beer@beer-laptop: ~/.qlive/conference
0x012000c4 0 12134 beer-laptop Common threads: Awk by example, Part 1 - Mozilla Firefox
beer@beer-laptop# wmctrl -lp | grep Firefox | awk -F" " "{print $1}"
0x012000c4 0 12134 beer-laptop Common threads: Awk by example, Part 1 - Mozilla Firefox
- 在这种情况下，我更喜欢= 0x012000c4
I like to get window pid (only firefox) from wmctrl, i tried wmctrl -lp | grep Firefox | awk -F" " "{print $1}" but output not match my expect. Help please.
beer@beer-laptop# wmctrl -lp
0x0160001b -1 6504 beer-laptop x-nautilus-desktop
0x016000bd 0 6504 beer-laptop conference - File Browser
0x03e00003 0 0 N/A XBMC Media Center
0x03800081 0 7282 beer-laptop Xbmc_ConferenceWindow.py (~/.qlive/xbmc-conference) - gedit
0x0352f117 0 6963 beer-laptop Ask a Question - Stack Overflow - Chromium
0x01400040 -1 6503 beer-laptop Top Expanded Edge Panel
0x01400003 -1 6503 beer-laptop Bottom Expanded Edge Panel
0x03202deb 0 6866 beer-laptop beer@beer-laptop: ~/.qlive/conference
0x012000c4 0 12134 beer-laptop Common threads: Awk by example, Part 1 - Mozilla Firefox
beer@beer-laptop# wmctrl -lp | grep Firefox | awk -F" " "{print $1}"
0x012000c4 0 12134 beer-laptop Common threads: Awk by example, Part 1 - Mozilla Firefox
- In this case my prefer = 0x012000c4
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不需要 grep。 awk 会做到这一点。另外，默认的字段分隔符是空格，因此无需指定。另外，请在 awk 脚本周围使用单引号，这样 shell 就不会扩展 $1。这就是你的脚本失败的原因。 $1 变成了空，你的 awk 操作变成了“print”，打印了整行。
No need for grep. Awk will do that. Also the default field separator is whitespace, so no need to specify that. Also, use single quotes around your awk script so the shell doesn't expand $1. That's why your script failed. $1 turned into nothing and your awk action became "print", which prints the whole line.
将
{print $1}周围的双引号替换为单引号。这将阻止 shell 扩展$1。Replace the double quotes around
{print $1}with single quotes. That will prevent the shell from expanding$1.awk '{打印$1}'
awk '{print $1}'
你可以这样做：
You can do just: