{"id":1826,"date":"2008-11-12T23:57:05","date_gmt":"2008-11-12T23:57:05","guid":{"rendered":"http:\/\/dev001.dl\/yan\/wdp\/?p=26"},"modified":"2026-01-20T06:03:52","modified_gmt":"2026-01-20T06:03:52","slug":"bash-if","status":"publish","type":"post","link":"http:\/\/www.lalife.net\/?p=1826","title":{"rendered":"bash — if"},"content":{"rendered":"\n
#!\/bin\/bash\nif [ -n \"$1\" ];then\n    filename = $1;\nelse\n    filename = date --date=<\/span>'1 hour ago'\" + %Y-%m-%d.%H\"`;\nfi<\/code><\/pre>\n\n\n
Compare numbers with -gt -lt -ne -eq<\/strong><\/p>\n
if [ “${size}” -gt 100 ];then
\u00a0\u00a0echo $size
fi<\/div>\n
Compare strings with = !=<\/strong><\/p>\n
if [ “${domain}” = “lalife.net” ];then
echo “correct”
fi
(#if [ “${domain}”=”lalife.net” ];then (##this won’t work without space around “=” or “!=”)\n
When using [[ ]]
if [[ ${domain} = “lalife.net” ]];then
echo “correct”
fi<\/p>\n
([ ] needs the variable to be inside of “”)<\/p>\n
Match
if [[ ${domain} =~ “lalife.net” ]];then
echo “correct”
fi
([ ] doesn’t work with =~)<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"
Compare numbers with -gt -lt -ne -eq if [ “${size}” -gt 100 ];then\u00a0\u00a0echo $sizefi Compare strings with = != if [ “${domain}” = “lalife.net” ];thenecho “correct”fi(#if [ “${domain}”=”lalife.net” ];then (##this won’t work without space around “=” or “!=”) When using … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[37],"class_list":["post-1826","post","type-post","status-publish","format-standard","hentry","category-shell","tag-bash"],"_links":{"self":[{"href":"http:\/\/www.lalife.net\/index.php?rest_route=\/wp\/v2\/posts\/1826","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.lalife.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.lalife.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.lalife.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.lalife.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1826"}],"version-history":[{"count":5,"href":"http:\/\/www.lalife.net\/index.php?rest_route=\/wp\/v2\/posts\/1826\/revisions"}],"predecessor-version":[{"id":1979,"href":"http:\/\/www.lalife.net\/index.php?rest_route=\/wp\/v2\/posts\/1826\/revisions\/1979"}],"wp:attachment":[{"href":"http:\/\/www.lalife.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1826"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.lalife.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1826"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.lalife.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1826"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}