Tips for co-using/converting/switching Ledger and hledger.
Ledger's and hledger's journal formats are the same at the core, so you can continue using both tools on the same files, if you are careful to avoid syntax that is specific to one or the other. See FAQ on differences.
However if you are a long-time Ledger user, you will certainly have Ledger-specific syntax, so for most Ledger users the quickest way to tap into hledger reports is some variant of
$ ledger print | hledger -f- CMD
The print command discards most of the Ledger-specific syntax, and the output is usually hledger compatible journal entries. This is good enough for most reporting needs. Some examples:
$ ledger print | hledger -f- check # check for problems $ ledger print | hledger -f- stats # show journal statistics $ ledger print | hledger -f- is -MAS -2 # summarise monthly revenues/expenses $ ledger print | hledger -f- web # view journal in hledger-web WUI $ hledger-ui -f <(ledger print) # view journal in hledger-ui TUI (works in bash)