Question

有一个我想要的文件

libqt4-dbus   
libqt4-network   
libqt4-script   
libqt4-test   
libqt4-xml   
libqtcore4   
libqt4-designer   
libqt4-opengl   
libqt4-svg   
libqtgui4

如何编写sed命令，例如sed 's/ /' test

这是名为test

的文件

以下软件包具有未满足的依赖项：

libqt4-core：取决于：libqt4-dbus（= 4：4.8.2 + dfsg-10）但是   4：4.8.2 + dfsg-2将被安装                  取决于：libqt4-network（= 4：4.8.2 + dfsg-10）但是要安装4：4.8.2 + dfsg-2                  取决于：libqt4-script（= 4：4.8.2 + dfsg-10）但不会安装
                 取决于：libqt4-test（= 4：4.8.2 + dfsg-10）但不会安装
                 取决于：libqt4-xml（= 4：4.8.2 + dfsg-10）但要安装4：4.8.2 + dfsg-2                  取决于：libqtcore4（= 4：4.8.2 + dfsg-10）但是要安装4：4.8.2 + dfsg-2 libqt4-gui：取决于：   libqt4-designer（= 4：4.8.2 + dfsg-10）但它不会   安装
                取决于：libqt4-opengl（= 4：4.8.2 + dfsg-10）但是要安装4：4.8.2 + dfsg-2                 取决于：libqt4-svg（= 4：4.8.2 + dfsg-10）但不会安装
                取决于：libqtgui4（= 4：4.8.2 + dfsg-10）但要安装4：4.8.2 + dfsg-2

Answer 1

假设存在某种格式故障：

Depends: libqtcore4 (= 4:4.8.2+dfsg-10) but 4:4.8.2+dfsg-2 is to be installed libqt4-gui : Depends: libqt4-designer (= 4:4.8.2+dfsg-10) but it is not going to be installed

（所以实际上它可能是：

Depends: libqtcore4 (= 4:4.8.2+dfsg-10) but 4:4.8.2+dfsg-2 is to be installed
libqt4-gui : Depends: libqt4-designer (= 4:4.8.2+dfsg-10) but it is not going to be installed

）然后这应该做：

sed 's/.*Depends: \([^ ]*\) .*/\1/' lib-dep-list

给定数据文件lib-dep-list：

libqt4-core : Depends: libqt4-dbus (= 4:4.8.2+dfsg-10) but 4:4.8.2+dfsg-2 is to be installed
Depends: libqt4-network (= 4:4.8.2+dfsg-10) but 4:4.8.2+dfsg-2 is to be installed
Depends: libqt4-script (= 4:4.8.2+dfsg-10) but it is not going to be installed
Depends: libqt4-test (= 4:4.8.2+dfsg-10) but it is not going to be installed
Depends: libqt4-xml (= 4:4.8.2+dfsg-10) but 4:4.8.2+dfsg-2 is to be installed
Depends: libqtcore4 (= 4:4.8.2+dfsg-10) but 4:4.8.2+dfsg-2 is to be installed
libqt4-gui : Depends: libqt4-designer (= 4:4.8.2+dfsg-10) but it is not going to be installed
Depends: libqt4-opengl (= 4:4.8.2+dfsg-10) but 4:4.8.2+dfsg-2 is to be installed
Depends: libqt4-svg (= 4:4.8.2+dfsg-10) but it is not going to be installed
Depends: libqtgui4 (= 4:4.8.2+dfsg-10) but 4:4.8.2+dfsg-2 is to be installed

输出结果为：

libqt4-dbus
libqt4-network
libqt4-script
libqt4-test
libqt4-xml
libqtcore4
libqt4-designer
libqt4-opengl
libqt4-svg
libqtgui4

Answer 2

使用awk

 awk -v RS="Depends:" 'NR>1{print $1}' temp.txt

写一个sed命令来提取单词

2 个答案: