Shell command variable method to remove spaces

Shell variable removal method

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1. Remove left and right spaces

> temp=’ x  y, oio213   ’
> echo  $(echo $temp)
> 结果:x  y, oio213

2. Remove all spaces

> temp=’ x  y, oio213   ’
> echo  ${temp// /}
> 结果:xy,oio213

3. Remove all spaces [awk]

> temp=’ x  y, oio213   ’
> echo "$temp" | awk '{gsub(/ /,"")}1'
> 结果:xy,oio213