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- seek(n) Tcl Built-In Commands
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- NAME
- seek - Change the access position for an open file
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- SYNOPSIS
- seek _f_i_l_e_I_d _o_f_f_s_e_t ?_o_r_i_g_i_n?
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- DESCRIPTION
- Change the current access position for _f_i_l_e_I_d. _F_i_l_e_I_d must
- have been the return value from a previous call to open, or
- it may be stdin, stdout, or stderr to refer to one of the
- standard I/O channels. The _o_f_f_s_e_t and _o_r_i_g_i_n arguments
- specify the position at which the next read or write will
- occur for _f_i_l_e_I_d. _O_f_f_s_e_t must be an integer (which may be
- negative) and _o_r_i_g_i_n must be one of the following:
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- start
- The new access position will be _o_f_f_s_e_t bytes from the
- start of the file.
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- current
- The new access position will be _o_f_f_s_e_t bytes from the
- current access position; a negative _o_f_f_s_e_t moves the
- access position backwards in the file.
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- end The new access position will be _o_f_f_s_e_t bytes from the
- end of the file. A negative _o_f_f_s_e_t places the access
- position before the end-of-file, and a positive _o_f_f_s_e_t
- places the access position after the end-of-file.
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- The _o_r_i_g_i_n argument defaults to start. This command returns
- an empty string.
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- KEYWORDS
- access position, file, seek
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- Tcl 1
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