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H

• h_errno - error return value for network database operations
• halfdelay - control input character delay mode
• has_colors - indicate whether terminal supports colours
• has_ic, has_il - query functions for terminal insert and delete capability
• hash - remember or report utility locations
• hcreate, hdestroy, hsearch - manage hash search table
• head - copy the first part of files
• hline, mvhline, mvvline, mvwhline, mvwvline, vline, whline, wvline
• hline_set, mvhline_set, mvvline_set, mvwhline_set, mvwvline_set, vline_set,
• htonl, htons, ntohl, ntohs - convert values between host and network byte order
• hypot - Euclidean distance function

• hard limit
• hard link
• home directory