http:\/\/search.aol.com\/aol\/search?q=shell+strip+space<\/a><\/p>\n \u5b57\u7b26\u4e32\u622a\u53d6<\/p>\n \u5b57\u7b26\u4e32\u66ff\u6362<\/p>\n \u5dee\u4e0d\u591a\u5c31\u8fd9\u4e9b\u4e86\uff0c\u5176\u5b83\u7684\u4e5f\u591a\u591a\u5c11\u5c11\u662f\u4e00\u4e9b\u53d8\u5f62\u2026\u2026<\/p>\n <\/p>\n <\/p>\n","protected":false},"excerpt":{"rendered":" 1.\u5728bash\u4e2d\u5982\u4f55\u6e05\u9664\u67d0\u4e2a\u53d8\u91cf\u5468\u56f4\u7684\u7a7a\u767d\u7b26\u53f7\uff08\u8d77\u5230\u7c7b\u4f3c\u4e8ePython\u4e2d\u7684strip()\u51fd\u6570\u7684\u4f5c\u7528\uff09\uff1f htt […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23,11,12],"tags":[83,77],"class_list":["post-1792","post","type-post","status-publish","format-standard","hentry","category-knowledgebase-2","category-linux","category-tools","tag-bash","tag-grep"],"views":3128,"_links":{"self":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/1792","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/comments?post=1792"}],"version-history":[{"count":0,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/posts\/1792\/revisions"}],"wp:attachment":[{"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/media?parent=1792"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/categories?post=1792"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ixyzero.com\/blog\/wp-json\/wp\/v2\/tags?post=1792"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}\n
\u65b9\u6cd5\u4e00\uff1atr\u547d\u4ee4<\/h6>\n
tr -d ' '\necho \" test test test \" | tr -d ' '<\/pre>\n
\u65b9\u6cd5\u4e8c\uff1ased\u547d\u4ee4<\/h6>\n
# sed 's\/ \/\/g'\n# echo \" test test test \" | sed 's\/ *$\/\/'\n# echo \" test test test \" | sed 's\/^ *\/\/'\n# echo \" test test test \" | sed -e 's\/^ *\/\/' -e 's\/ *$\/\/'<\/pre>\n
\u65b9\u6cd5\u4e09\uff1a<\/h6>\n
# rtrim=${trimmed%% }\n# ltrim=${trimmed## }<\/pre>\n# echo ${s\/\/[[:blank:]]\/}<\/pre>\n\u65b9\u6cd5\u56db\uff1axargs\u547d\u4ee4<\/h6>\n
# echo \" lol \" | xargs<\/pre>\n
2.\u83b7\u53d6\u6587\u4ef6\u7684\u76ee\u5f55\u540d\/\u6587\u4ef6\u540d<\/h5>\n
#!\/bin\/bash\n\n# 1.\u83b7\u53d6\u811a\u672c\u6240\u5728\u76ee\u5f55\u7684\u540d\u79f0\nbase_dir=$(dirname $0)\/..\npwd\ncd $base_dir\npwd\n\n# 2.\u83b7\u53d6\u811a\u672c\u7684\u6587\u4ef6\u540d\nfile_abs_name=$0\nbase_name=${file_abs_name##\/*\/}\nbase_name_no_ext=${base_name%.*}<\/pre>\n\n
3.grep\u547d\u4ee4\u7684\u4e00\u4e9btips<\/h5>\n
-e PATTERN, --regexp=PATTERN\n\t Use PATTERN as\tthe pattern.\tThis can be used to specify multiple search patterns, or to protect a pattern beginning with a hyphen (-). (-e is specified by POSIX.)\n\n -f FILE, --file=FILE\n\t Obtain patterns from FILE, one per line.\tThe empty file contains zero patterns, and therefore matches nothing. (-f is specified by POSIX.)\n\n -i, --ignore-case\n\t Ignore case distinctions in both the PATTERN and the input files. (-i is specified by POSIX.)\n\n -v, --invert-match\n\t Invert the sense of matching, to select non-matching lines. (-v is specified by POSIX.)\n\n -c, --count\n\t Suppress normal output; instead print a count of matching lines for each input file. With the -v, --invert-match option (see below),\tcount non-matching lines. (-c is specified by POSIX.)\n\n -l, --files-with-matches\n\t Suppress\tnormal output; instead print the name of each input file from which output would normally have been printed. The scanning will stop on the first match. (-l is specified by POSIX.)\n\n -q, --quiet, --silent\n\t Quiet; do not write anything to standard output.\tExit immediately with zero status if any match is found, even if an error was detected. Also see the -s or --no-messages option. (-q is specified by POSIX.)\n\n -n, --line-number\n\t Prefix each line of output with the 1-based line number within its input file. (-n is specified by POSIX.)\n\nContext Line Control\n -A NUM, --after-context=NUM\n\t Print NUM lines of trailing context after matching lines. Places a line containing a group separator (--) between contiguous groups of matches. With the -o or --only-matching option, this has no effect and a warning is given.\n\n -B NUM, --before-context=NUM\n\t Print NUM lines of leading context before matching lines. Places a line containing a group separator (--) between contiguous groups of matches. With the -o or --only-matching option, this has no effect and a warning is given.\n\n -C NUM, -NUM, --context=NUM\n\t Print NUM lines of output context. Places a line containing a group separator\t(--) between contiguous groups of matches. With\tthe -o or --only-matching option, this has no effect and a warning is given.<\/pre>\n
# cat \/proc\/net\/dev\nInter-| Receive | Transmit\n face |bytes packets errs drop fifo frame compressed multicast|bytes packets errs drop fifo colls carrier compressed\n lo:14551283 76129 0 0 0 0 0 0 14551283 76129 0 0 0 0 0 0\n eth0:18007778 145326 0 0 0 0 0 0 502374 3647 0 0 0 0 0 0\n sit0: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0\n\nMethod.2\n# grep -A1 'lo:' \/proc\/net\/dev | grep -v 'lo:' | awk -F':' '{print $1}'\n eth0\n\n# grep -A1 'lo:' \/proc\/net\/dev | grep -v 'lo:' | awk -F':' '{print $1}' | sed 's\/[[:space:]]\/\/g'\neth0\n\nMethod.3\nIn [5]: print os.popen(\"grep -A1 'lo:' \/proc\/net\/dev | grep -v 'lo:' | awk -F':' '{print $1}' | sed 's\/[[:space:]]\/\/g'\").read()\neth0\nIn [6]: print os.popen(\"grep -A1 'lo:' \/proc\/net\/dev | grep -v 'lo:' | awk -F':' '{print $1}'\").read().strip()\neth0<\/pre>\n4.shell\u4e2d\u7684\u6761\u4ef6\u6d4b\u8bd5<\/h5>\n
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5.\u4f7f\u7528shell\u811a\u672c\u8fdb\u884c\u81ea\u52a8\u5316\u6d4b\u8bd5<\/h5>\n
\n
6.\u67e5\u770bLinux\u7684\u5185\u6838\u7248\u672c\u547d\u4ee4<\/h5>\n
$ uname -a\n\n$ lsb_release -a\n\n$ cat \/etc\/issue\n\n$ cat \/proc\/version\n\n$ getconf LONG_BIT\n\n$ file \/bin\/ls\n\n$ arch<\/pre>\n
7.\u5bfc\u51famanual\u4e3atxt\u6587\u4ef6<\/h5>\n
# man grep | col -b >grep_manual.txt<\/pre>\n