Bash/Mgrep
From Attie's Wiki
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* If the output ''doesnt'' flow over the screen, <code>less</code> quits immediately | * If the output ''doesnt'' flow over the screen, <code>less</code> quits immediately | ||
* Automatically detects if the output is to a terminal or pipe, utilizing <code>less</code> and highlighting for the former | * Automatically detects if the output is to a terminal or pipe, utilizing <code>less</code> and highlighting for the former | ||
+ | * By default uses case ''insensitive'' search, just setting GREP_OPTIONS (even to empty) will disable this | ||
<source lang="bash"> | <source lang="bash"> | ||
Line 37: | Line 38: | ||
fi | fi | ||
CMD="find \"${DIRECTORY}\" ${FILES}" | CMD="find \"${DIRECTORY}\" ${FILES}" | ||
+ | |||
+ | if [ -z "${GREP_OPTIONS+x}" ]; then | ||
+ | GREP_OPTIONS="-i" | ||
+ | fi | ||
if [ -t 1 ]; then | if [ -t 1 ]; then |
Revision as of 16:15, 29 October 2012
This is a useful tool that extends grep.
- Expression input is at the front, allowing quick & easy editing
- Search directory defaults to
.
, but can be easily modified - Files checked defaults to '
*.c
' and '*.h
', but can be easily changed - Recursively locates all files matching given names (e.g:
*.c
) - Multiple filenames / masks / patterns may be specified
- Uses
grep
's extended regex mode - Output shows file and line number, and is highlighted
- If the output flows over the screen,
less
allows you to review the results - If the output doesnt flow over the screen,
less
quits immediately - Automatically detects if the output is to a terminal or pipe, utilizing
less
and highlighting for the former - By default uses case insensitive search, just setting GREP_OPTIONS (even to empty) will disable this
#!/bin/bash if [ $# -lt 1 ]; then echo "usage:" echo " $0 <expression> [directory] [filename..]" exit 1 fi EXPRESSION="$1"; shift if [ $# -lt 1 ]; then DIRECTORY="." else DIRECTORY="$1"; shift fi if [ $# -lt 1 ]; then FILES="-name '*.c' -or -name '*.h'" else FILES="-name '$1'"; shift while [ $# -ne 0 ]; do FILES="${FILES} -or -name '$1'"; shift done fi CMD="find \"${DIRECTORY}\" ${FILES}" if [ -z "${GREP_OPTIONS+x}" ]; then GREP_OPTIONS="-i" fi if [ -t 1 ]; then PIPE=/tmp/$$.mgrep #trap "exec 1>&-; sleep 0.1; rm -f ${PIPE}" EXIT mknod ${PIPE} p less -FKnRX < ${PIPE} & exec 3>&1 exec 1>${PIPE} GREP_OPTIONS="--color=always ${GREP_OPTIONS}" else PIPE="" fi eval ${CMD} | \ while read -r f; do grep -niH -E ${GREP_OPTIONS} -- "${EXPRESSION}" "${f}" done if [ "${PIPE}" != "" ]; then exec 1>&3 exec 3>&- wait rm -f ${PIPE} fi