https://mayapy.wordpress.com/2012/04/23/fix-texture-paths-in-maya-python-script/
import maya.cmds as cmds
import os
def renameTex(newName):
tex=cmds.ls(sl=True,type="file")
for item in tex:
fullpath = cmds.getAttr("%s.fileTextureName" %item)
fileName= fullpath.split("/")[-1]
newPath= os.path.join(newName,fileName)
cmds.setAttr("%s.fileTextureName" %item, newPath,type="string")
def selectDir():
folder=cmds.fileDialog2(cap="locate folder",fm=3)
uniToStr=str(folder)
filePath=uniToStr.split("'")[1]
cmds.textField(pathText, edit=True,text=filePath)
global newName
newName=filePath
win=cmds.window(title="RV TEXTURE PATH FIX",w=350,h=150)
cmds.columnLayout(adjustableColumn=True )
cmds.text("FIRSTlect your file nodes in Hypershade!!",bgc=(1,0,0))
cmds.frameLayout(l="browse folder for textures")
cmds.flowLayout()
cmds.text("file",h=25)
pathText=cmds.textField(w=250,h=25)
loadBtn=cmds.button(w=50,h=25,label="get",c="selectDir()")
cmds.setParent( '..' )
fixit=cmds.button(l="Fix textures", c="renameTex(newName)")
cmds.setParent( '..' )
cmds.showWindow(win)
