I use some magic in $PROMPT_COMMAND to automatically save every command I run to a database:
我在$PROMPT_COMMAND中使用了一些技巧来自动保存我运行到数据库的每个命令:
PROMPT_COMMAND='save_command "$(history 1)"'
where save_command is a more complicated function. It would be nice to save also the head/tail of the output of each command, but I can't think of a reasonable way to do this, other than manually prepending some sort of shell function to everything I type (and this becomes even more painful with complicated pipelines or boolean expressions). Basically, I just want the first and last 10 lines of whatever went to /dev/tty to get saved to a variable (or even a file) - is there any way to do this?
save_command是一个更复杂的函数。就好了保存的头/尾每个命令的输出,但是我想不出一个合理的方法,除了手动将某种外壳函数我所有类型(这变得更加痛苦和复杂的管道或布尔表达式)。基本上，我只是想让/dev/tty的前10行和最后10行保存到一个变量(甚至是一个文件)——有什么方法可以做到这一点吗?
2 个解决方案
#1
2
script(1) will probably get you started. It won't let you just record the first and last 10 lines, but you can do some post-processing on its output.
脚本(1)可能会启动。它不会让你只记录前10行和后10行，但是你可以对它的输出做一些后处理。
#2
2
bash | tee /dev/tty ./bashout
This saves all stdout gets saved to bashout.
这将保存所有stdout以攻击。
bash | tee /dev/tty | tail > ./bashout
The tail of stdout of every command gets written to bashout.
每个命令的尾部都会被写入bashout。
bash | tee /dev/tty | sed -e :a -e '10p;$q;N;11,$D;ba' > ./bashout
The first and last 10 lines of stdout of every command gets written to bashout.
每个命令的前10行和最后10行stdout都被编写为bashout。
These don't save the command, but if you modify your save_command to print the command to stdout, it will get in there.
这些不会保存命令，但是如果您修改save_command以将命令打印到stdout，它就会到达那里。
#1
2
script(1) will probably get you started. It won't let you just record the first and last 10 lines, but you can do some post-processing on its output.
脚本(1)可能会启动。它不会让你只记录前10行和后10行，但是你可以对它的输出做一些后处理。
#2
2
bash | tee /dev/tty ./bashout
This saves all stdout gets saved to bashout.
这将保存所有stdout以攻击。
bash | tee /dev/tty | tail > ./bashout
The tail of stdout of every command gets written to bashout.
每个命令的尾部都会被写入bashout。
bash | tee /dev/tty | sed -e :a -e '10p;$q;N;11,$D;ba' > ./bashout
The first and last 10 lines of stdout of every command gets written to bashout.
每个命令的前10行和最后10行stdout都被编写为bashout。
These don't save the command, but if you modify your save_command to print the command to stdout, it will get in there.
这些不会保存命令，但是如果您修改save_command以将命令打印到stdout，它就会到达那里。