Kids Return: Shell

Showing posts with label Shell. Show all posts

Thursday, September 27, 2012

$ !!

执行上一个命令

$ !x

执行上一个以"x"开头的命令

$ !xyz

执行上一个以"xyz"开头的命令

$ cat ~git/repository/foo.git/hooks/post-receive
$ vi !$

!$会被扩展为上一个命令的最后一个argument
类似的!*会被扩展为上一个命令的所有argument

$ ./exe_something &
$ LAST_PID= $!

$!为上一个命令的PID

$ ./exe_something 
$ echo $?

$?为上一个命令的exit状态

Statement	sh	tcsh	bash
if-then-else	if [ expression ] then ... else ... fi	if (expression) then ... else ... endif 注:then必须和if同一行	if [ expression ] then ... else ... fi
for-loop	for var in (list) do .... done	foreach var (list) ... end	for var in [list] do ... done

Statement

tcsh

bash

if-then-else

if [ expression ] 
then
    ...
else
    ...
fi

if (expression) then
    ...
else
    ...
endif
注:then必须和if同一行

if [ expression ]
then
    ...
else 
    ...
fi

for-loop

for var in (list)
do
    ....
done

foreach var (list)
    ...
end

for var in [list]
do
    ...
done

Loop in Bash: http://www.cyberciti.biz/faq/bash-for-loop/

Sh: http://www.freeos.com/guides/lsst/
Bash: http://tldp.org/LDP/abs/html/