QSUBST(1) BSD General Commands Manual QSUBST(1)
qsubst -- query-replace strings in files
qsubst str1 str2 [flags] file [file [...]]
qsubst reads its options (see below) to get a list of files. For each file on this list, it
then replaces str1 with str2 wherever possible in that file, depending on user input (see
below). The result is written back onto the original file.
For each potential substitution found, the user is prompted with a few lines before and
after the line containing the string to be substituted. The string itself is displayed
using the terminal's standout mode, if any. Then one character is read from the terminal.
This is then interpreted as follows (this is designed to be like Emacs' query-replace-
space Replace this occurrence and go on to the next one.
. Replace this occurrence and don't change any more in this file (i.e., go on to
the next file).
, Tentatively replace this occurrence. The lines as they would look if the sub-
stitution were made are printed out. Then another character is read and it is
used to decide the result as if the tentative replacement had not happened.
n Don't change this one; just go on to the next one.
^G Don't change this one or any others in this file, but instead simply go on to
the next file.
! Change the rest in this file without asking, then go on to the next file (at
which point qsubst will start asking again).
? Print out the current filename and ask again.
The first two arguments to qsubst are always the string to replace and the string to replace
it with. The options are as follows:
-w The search string is considered as a C symbol; it must be bounded by non-
symbol characters. This option toggles. ('w' for 'word'.)
-noask Enter ! mode automatically at the beginning of each file.
-ask Negate -go, that is, ask as usual.
-cN (Where N is a number.) Give N lines of context above and below the line
with the match when prompting the user.
-CAN (Where N is a number.) Give N lines of context above the line with the
match when prompting the user.
-CBN (Where N is a number.) Give N lines of context below the line with the
match when prompting the user.
-f filename The filename argument is one of the files qsubst should perform substitu-
-F filename qsubst reads filename to get the names of files to perform substitutions
in. The names should appear one to a line.
The default amount of context is -c2, that is, two lines above and two lines below the line
with the match.
Arguments not beginning with a - sign in the options field are implicitly preceded by -f.
Thus, -f is really needed only when the file name begins with a - sign.
qsubst reads its options in order and processes files as it gets them. This means, for
example, that a -go will affect only files named after the -go.
The most context you can get is ten lines each, above and below.
str1 is limited to 512 characters; there is no limit on the size of str2. Neither one may
contain a NUL.
NULs in the file may cause qsubst to make various mistakes.
If any other program modifies the file while qsubst is running, all bets are off.
der Mouse <email@example.com>
BSD September 4, 1999 BSD