shell脚本echo输出不换行功能增强实例
这是第8/101个脚本
Thereareasmanywaystosolvethisquirkyechoproblemastherearepagesinthisbook.Oneofmyfavoritesisverysuccinct:
functionechon
{
echo"$*"|awk'{printf"%s"$0}'
}
Youmayprefertoavoidtheoverheadincurredwhencallingtheawkcommand,however,andifyouhaveauser-levelcommandcalledprintfyoucanuseitinstead:
echon()
{
printf"%s""$*"
}
Butwhatifyoudon'thaveprintfandyoudon'twanttocallawk?Thenusethetrcommand:
echon()
{
echo"$*"|tr-d'\n'
}
Thismethodofsimplychoppingoutthecarriagereturnwithtrisasimpleandefficientsolutionthatshouldbequiteportable.
这个脚本很简单，就是可以用3种不同的函数（方法）来实现，输出后不换行。