How to show corpus text in R tm package?

You can try converting your corpus text into a dataframe, and accessing the required text from the dataframe itself. I have used the built-in sample data "crude" (from the tm package) as an example.

data("crude")
dataframe<-data.frame(text=unlist(sapply(crude, `[`, "content")), stringsAsFactors=F)

dataframe[1,]
[1] "Diamond Shamrock Corp said that\neffective today it had cut its contract prices for crude oil by\n1.50 dlrs a barrel.\n    The reduction brings its posted price for West Texas\nIntermediate to 16.00 dlrs a barrel, the copany said.\n    \"The price reduction today was made in the light of falling\noil product prices and a weak crude oil market,\" a company\nspokeswoman said.\n    Diamond is the latest in a line of U.S. oil companies that\nhave cut its contract, or posted, prices over the last two days\nciting weak oil markets.\n Reuter"

Here is a simple and direct way to display the text of a corpus:

strwrap(corpus[[1]])

For the crude data this will output

[1] "Diamond Shamrock Corp said that effective today it had cut its contract"      
[2] "prices for crude oil by 1.50 dlrs a barrel.  The reduction brings its posted" 
[3] "price for West Texas Intermediate to 16.00 dlrs a barrel, the copany said."   
[4] "\"The price reduction today was made in the light of falling oil product"     
[5] "prices and a weak crude oil market,\" a company spokeswoman said.  Diamond is"
[6] "the latest in a line of U.S. oil companies that have cut its contract, or"    
[7] "posted, prices over the last two days citing weak oil markets.  Reuter"

I can confirm that as of tm 0.6-1 the inspect does not print pretty. You can pair it with the qdap package that I maintain to convert easily to a data.frame as folows:

library(qdap)
as.data.frame(crude)

To make it more ike the old inspect behavior you can use:

as.data.frame(crude) %>%
    with(., invisible(sapply(text, function(x) {strWrap(x); cat("\n\n")})))

This looks like:

Diamond Shamrock Corp said that effective today it had cut its
contract prices for crude oil by 1.50 dlrs a barrel. The reduction
brings its posted price for West Texas Intermediate to 16.00 dlrs a
barrel, the copany said. "The price reduction today was made in the
light of falling oil product prices and a weak crude oil market," a
company spokeswoman said. Diamond is the latest in a line of U.S. oil
companies that have cut its contract, or posted, prices over the last
two days citing weak oil markets. Reuter


OPEC may be forced to meet before a scheduled June session to
readdress its production cutting agreement if the organization wants
to halt the current slide in oil prices, oil industry analysts said.
"The movement to higher oil prices was never to be as easy as OPEC
thought. They may need an emergency meeting to sort out the
problems," said Daniel Yergin, director of Cambridge Energy Research
Associates, CERA. Analysts and oil industry sources said the problem
OPEC faces is excess oil supply in world oil markets. "OPEC's problem
is not a price problem but a production issue and must be addressed
in that way," said Paul Mlotok, oil analyst with Salomon Brothers
Inc. He said the market's earlier optimism about OPE
.
.
.

This works in mine, to print the content text, with latest version of tm,

corpus[[1]]$content

Note: More or less as suggested by Ricky in the previous comment. Sorry, I wanted to write comment, only my rep is only 25 (need min. of 50 rep to comment).