[gmx-users] erorr while using grep command

[Sajad Ahrari]

hello every one!
I am trying to omit TPO(witch stands for phospho-tyrosine) from my pdb file by 
executing the command"grep TPO 10L5.pdb > TPO.pdb". but i am being facing with 
this erorr"grep: 10L5.pdb: No such file or directory" can any one help?
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