Avoid error with cat command when src file doesn't exist
Test for file1 first.
[ -r file1 ] && cat ...See help test for details.
elaborating on @Ignacio Vazquez-Abrams :
if (test -a file1); then cat file1 > file2; fi
File1 is emptyFile2 consists below contentpraveenNow I am trying to append the content of file1 to file2Since file1 is empty to nullifying error using /dev/null so output will not show any errorcat file1 >>file 2>/dev/nullFile2 content not got deletedfile2 content exsistspraveen If [ -f file1 ]thencat file >> file2elsecat file1 >>file 2>/dev/nullfi