CODEWITHSUNDEEP
linuxbashshelldiff
ranjith
ranjith

Reputation: 53

diff commnad not working "missing operand after `diff'"

In diff command am getting following error. Kindly assist how can I specify I want to see difference in two files:

#current_unavail=ranjith

root@iitmserver1 tmp]# cat /tmp/ran
ranjith
[root@iitmserver1 tmp]#

#test=$(cat /tmp/ran)

[root@iitmserver1 tmp]# diff `$current_unavail` `$test`
diff: missing operand after `diff'
diff: Try `diff --help' for more information.
[root@iitmserver1 tmp]#

Upvotes: 1

Views: 10964

Answers (1)

Sammitch
Sammitch

Reputation: 32232

diff takes two filenames as arguments, where you appear to be passing in file contents as the first argument. You will want to change your script/commands to look more like:

current_unavail=/tmp/unavail_cn.out
result=$(diff $current_unavail /moes/home/pharthiphan/scripts/monitoring/unavail_cn/$last_unavail)

Alternatively, you can use Process Substitution to pass the output of a command into another command that is expecting a file. eg:

diff <(echo -e "foo\nbar") <(echo -e "foo\nbaz")

However, while good to know about, this would seem to be a needless level of complexity for your current problem.

Upvotes: 2

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