# ICONV

NAME
SYNOPSIS
DESCRIPTION
ENVIRONMENT
EXAMPLES
CONFORMING TO
SEE ALSO

## NAME

iconv − character set conversion

## SYNOPSIS

iconv [OPTION...] [−f encoding] [−t encoding] [inputfile ...]
iconv −l

## DESCRIPTION

The iconv program converts text from one encoding to another encoding. More precisely, it converts from the encoding given for the −f option to the encoding given for the −t option. Either of these encodings defaults to the encoding of the current locale. All the inputfiles are read and converted in turn; if no inputfile is given, the standard input is used. The converted text is printed to standard output.

The encodings permitted are system dependent. For the libiconv implementation, they are listed in the iconv_open(3) manual page.

Options controlling the input and output format:
−f encoding, −−from−code=encoding

Specifies the encoding of the input.

−t encoding, −−to−code=encoding

Specifies the encoding of the output.

Options controlling conversion problems:

| −c |  | When this option is given, characters that cannot be converted are silently discarded, instead of leading to a conversion error.

−−unicode−subst=formatstring

When this option is given, Unicode characters that cannot be represented in the target encoding are replaced with a placeholder string that is constructed from the given formatstring, applied to the Unicode code point. The formatstring must be a format string in the same format as for the printf command or the printf() function, taking either no argument or exactly one unsigned integer argument.

−−byte−subst=formatstring

When this option is given, bytes in the input that are not valid in the source encoding are replaced with a placeholder string that is constructed from the given formatstring, applied to the byte’s value. The formatstring must be a format string in the same format as for the printf command or the printf() function, taking either no argument or exactly one unsigned integer argument.

−−widechar−subst=formatstring

When this option is given, wide characters in the input that are not valid in the source encoding are replaced with a placeholder string that is constructed from the given formatstring, applied to the byte’s value. The formatstring must be a format string in the same format as for the printf command or the printf() function, taking either no argument or exactly one unsigned integer argument.

Options controlling error output:
−s, −−silent

When this option is given, error messages about invalid or unconvertible characters are omitted, but the actual converted text is unaffected.

The iconv −l or iconv −−list command lists the names of the supported encodings, in a system dependent format. For the libiconv implementation, the names are printed in upper case, separated by whitespace, and alias names of an encoding are listed on the same line as the encoding itself.

## ENVIRONMENT

Conversion from/to EBCDIC encodings can be modified in a specific way: If the environment variable ICONV_EBCDIC_ZOS_UNIX is set to a non-empty value, the EBCDIC newline 0x15 will get mapped to LF instead of NEL.

## EXAMPLES

iconv −f ISO−8859−1 −t UTF−8

converts input from the old West-European encoding ISO−8859−1 to Unicode.

iconv −f KOI8−R −−byte−subst="<0x%x>"
−−unicode−subst="<U+%04X>"

converts input from the old Russian encoding KOI8−R to the locale encoding, substituting an angle bracket notation with hexadecimal numbers for invalid bytes and for valid but unconvertible characters.

iconv −−list

lists the supported encodings.

## CONFORMING TO

POSIX:2024

## SEE ALSO

iconv_open(3), locale(7)